diff --git a/application/application.ios.ts b/application/application.ios.ts
index 0363486016..ed0674491a 100644
--- a/application/application.ios.ts
+++ b/application/application.ios.ts
@@ -1,7 +1,7 @@
 import common = require("./application-common");
 import frame = require("ui/frame");
 import definition = require("application");
-import * as uiUtilsModule from "ui/utils";
+import * as uiUtils from "ui/utils";
 import * as typesModule from "utils/types";
 import * as fileResolverModule  from "file-system/file-name-resolver";
 import * as enumsModule from "ui/enums";
@@ -9,6 +9,8 @@ import * as enumsModule from "ui/enums";
 global.moduleMerge(common, exports);
 var typedExports: typeof definition = exports;
 
+var enums: typeof enumsModule
+
 class Responder extends UIResponder {
     //
 }
@@ -33,8 +35,6 @@ class Window extends UIWindow {
     }
 
     public layoutSubviews(): void {
-        var uiUtils: typeof uiUtilsModule = require("ui/utils");
-
         uiUtils.ios._layoutRootView(this._content, UIScreen.mainScreen().bounds);
     }
 }
diff --git a/camera/camera.ios.ts b/camera/camera.ios.ts
index 0b1b11ac38..26e4208786 100644
--- a/camera/camera.ios.ts
+++ b/camera/camera.ios.ts
@@ -1,4 +1,4 @@
-var types = require("utils/types");
+import types = require("utils/types");
 import * as cameraCommonModule from "./camera-common";
 import * as imageSourceModule from "image-source";
 import * as frameModule from "ui/frame";
diff --git a/http/http-request.android.ts b/http/http-request.android.ts
index a532260f62..bba0a88053 100644
--- a/http/http-request.android.ts
+++ b/http/http-request.android.ts
@@ -12,6 +12,27 @@ import http = require("http");
 var requestIdCounter = 0;
 var pendingRequests = {};
 
+var utils: typeof utilsModule;
+function ensureUtils() {
+    if (!utils) {
+        utils = require("utils/utils");
+    }
+}
+
+var imageSource: typeof imageSourceModule;
+function ensureImageSource() {
+    if (!imageSource) {
+        imageSource = require("image-source");
+    }
+}
+
+var platform: typeof platformModule;
+function ensurePlatform() {
+    if (!platform) {
+        platform = require("platform");
+    }
+}
+
 var completeCallback: com.tns.Async.CompleteCallback;
 function ensureCompleteCallback() {
     if (completeCallback) {
@@ -59,12 +80,11 @@ function onRequestComplete(requestId: number, result: com.tns.Async.Http.Request
                 }
             },
             toJSON: () => {
-                var utils: typeof utilsModule = require("utils/utils");
-
+                ensureUtils();
                 return utils.parseJSON(result.responseAsString);
             },
             toImage: () => {
-                var imageSource: typeof imageSourceModule = require("image-source");
+                ensureImageSource();
 
                 return new Promise<any>((resolveImage, rejectImage) => {
                     if (result.responseAsImage != null) {
@@ -111,7 +131,7 @@ function buildJavaOptions(options: http.HttpRequestOptions) {
         javaOptions.headers = arrayList;
     }
 
-    var platform: typeof platformModule = require("platform");
+    ensurePlatform();
 
     // pass the maximum available image size to the request options in case we need a bitmap conversion
     var screen = platform.screen.mainScreen;
diff --git a/http/http-request.ios.ts b/http/http-request.ios.ts
index 5fcbb310be..9dc5f455b6 100644
--- a/http/http-request.ios.ts
+++ b/http/http-request.ios.ts
@@ -2,7 +2,7 @@
  * iOS specific http request implementation.
  */
 import http = require("http");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 import * as imageSourceModule from "image-source";
 import * as utilsModule from "utils/utils";
 
@@ -10,12 +10,24 @@ var GET = "GET";
 var USER_AGENT_HEADER = "User-Agent";
 var USER_AGENT = "Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25";
 
+var utils: typeof utilsModule;
+function ensureUtils() {
+    if (!utils) {
+        utils = require("utils/utils");
+    }
+}
+
+var imageSource: typeof imageSourceModule;
+function ensureImageSource() {
+    if (!imageSource) {
+        imageSource = require("image-source");
+    }
+}
+
 export function request(options: http.HttpRequestOptions): Promise<http.HttpResponse> {
     return new Promise<http.HttpResponse>((resolve, reject) => {
 
         try {
-            var types: typeof typesModule = require("utils/types");
-
             var sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration();
             var queue = NSOperationQueue.mainQueue();
             var session = NSURLSession.sessionWithConfigurationDelegateDelegateQueue(
@@ -63,13 +75,11 @@ export function request(options: http.HttpRequestOptions): Promise<http.HttpResp
                                 raw: data,
                                 toString: () => { return NSDataToString(data); },
                                 toJSON: () => {
-                                    var utils: typeof utilsModule = require("utils/utils");
-
+                                    ensureUtils();
                                     return utils.parseJSON(NSDataToString(data));
                                 },
                                 toImage: () => {
-                                    var imageSource: typeof imageSourceModule = require("image-source");
-
+                                    ensureImageSource();
                                     if (UIImage.imageWithData["async"]) {
                                         return UIImage.imageWithData["async"](UIImage, [data])
                                                       .then(image => {
diff --git a/image-source/image-source-common.ts b/image-source/image-source-common.ts
index 1607ec0442..38aceb9fef 100644
--- a/image-source/image-source-common.ts
+++ b/image-source/image-source-common.ts
@@ -1,6 +1,13 @@
 import utils = require("utils/utils");
 import * as httpModule from "http";
 
+var http: typeof httpModule;
+function ensureHttp() {
+    if (!http) {
+        http = require("http");
+    }
+}
+
 // This is used for definition purposes only, it does not generate JavaScript for it.
 import definition = require("image-source");
 
@@ -30,7 +37,7 @@ export function fromNativeSource(source: any): definition.ImageSource {
 }
 
 export function fromUrl(url: string): Promise<definition.ImageSource> {
-    var http: typeof httpModule = require("http");
+    ensureHttp();
     return http.getImage(url);
 }
 
diff --git a/image-source/image-source.android.ts b/image-source/image-source.android.ts
index 4ed6ffb0b0..c37214636b 100644
--- a/image-source/image-source.android.ts
+++ b/image-source/image-source.android.ts
@@ -7,6 +7,27 @@ import * as enumsModule from "ui/enums";
 
 global.moduleMerge(common, exports);
 
+var utils: typeof utilsModule;
+function ensureUtils() {
+    if (!utils) {
+        utils = require("utils/utils");
+    }
+}
+
+var fs: typeof fileSystemModule;
+function ensureFS() {
+    if (!fs) {
+        fs = require("file-system");
+    }
+}
+
+var enums: typeof enumsModule;
+function ensureEnums() {
+    if (!enums) {
+        enums = require("ui/enums");
+    }
+}
+
 export class ImageSource implements definition.ImageSource {
     public android: android.graphics.Bitmap;
     public ios: UIImage;
@@ -14,7 +35,7 @@ export class ImageSource implements definition.ImageSource {
     public loadFromResource(name: string): boolean {
         this.android = null;
 
-        var utils: typeof utilsModule = require("utils/utils");
+        ensureUtils();
 
         var res = utils.ad.getApplicationContext().getResources();
         if (res) {
@@ -32,7 +53,7 @@ export class ImageSource implements definition.ImageSource {
     }
 
     public loadFromFile(path: string): boolean {
-        var fs: typeof fileSystemModule = require("file-system");
+        ensureFS();
 
         var fileName = types.isString(path) ? path.trim() : "";
         if (fileName.indexOf("~/") === 0) {
@@ -112,7 +133,7 @@ export class ImageSource implements definition.ImageSource {
 }
 
 function getTargetFromat(format: string): android.graphics.Bitmap.CompressFormat {
-    var enums: typeof enumsModule = require("ui/enums");
+    ensureEnums();
 
     switch (format) {
         case enums.ImageFormat.jpeg:
diff --git a/trace/trace.ts b/trace/trace.ts
index 9cafde5d32..4288eb4f0d 100644
--- a/trace/trace.ts
+++ b/trace/trace.ts
@@ -1,5 +1,5 @@
 import definition = require("trace");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 var _enabled = false;
 var _categories = {};
@@ -137,8 +137,6 @@ class ConsoleWriter implements definition.TraceWriter {
             return;
         }
 
-        var types: typeof typesModule = require("utils/types");
-
         var msgType;
         if (types.isUndefined(type)) {
             msgType = messageType.log;
diff --git a/ui/action-bar/action-bar-common.ts b/ui/action-bar/action-bar-common.ts
index e6994de256..2aa77517d7 100644
--- a/ui/action-bar/action-bar-common.ts
+++ b/ui/action-bar/action-bar-common.ts
@@ -6,10 +6,16 @@ import enums = require("ui/enums");
 import proxy = require("ui/core/proxy");
 import view = require("ui/core/view");
 import * as styleModule from "../styling/style";
-import * as dependencyObservableModule from "ui/core/dependency-observable";
 
 var ACTION_ITEMS = "actionItems";
 
+var style: typeof styleModule;
+function ensureStyle() {
+    if (!style) {
+        style = require("../styling/style");
+    }
+}
+
 export module knownCollections {
     export var actionItems = "actionItems";
 }
@@ -65,20 +71,18 @@ export class ActionBar extends view.View implements dts.ActionBar {
     }
     set titleView(value: view.View) {
         if (this._titleView !== value) {
-            var style: typeof styleModule = require("../styling/style");
-            var observable: typeof dependencyObservableModule = require("ui/core/dependency-observable");
-
+            ensureStyle();
             if (this._titleView) {
                 this._removeView(this._titleView);
-                this._titleView.style._resetValue(style.horizontalAlignmentProperty, observable.ValueSource.Inherited);
-                this._titleView.style._resetValue(style.verticalAlignmentProperty, observable.ValueSource.Inherited);
+                this._titleView.style._resetValue(style.horizontalAlignmentProperty, dependencyObservable.ValueSource.Inherited);
+                this._titleView.style._resetValue(style.verticalAlignmentProperty, dependencyObservable.ValueSource.Inherited);
             }
 
             this._titleView = value;
 
             if (this._titleView) {
-                this._titleView.style._setValue(style.horizontalAlignmentProperty, enums.HorizontalAlignment.center, observable.ValueSource.Inherited);
-                this._titleView.style._setValue(style.verticalAlignmentProperty, enums.VerticalAlignment.center, observable.ValueSource.Inherited);
+                this._titleView.style._setValue(style.horizontalAlignmentProperty, enums.HorizontalAlignment.center, dependencyObservable.ValueSource.Inherited);
+                this._titleView.style._setValue(style.verticalAlignmentProperty, enums.VerticalAlignment.center, dependencyObservable.ValueSource.Inherited);
                 this._addView(this._titleView);
             }
 
diff --git a/ui/action-bar/action-bar.android.ts b/ui/action-bar/action-bar.android.ts
index c8014cef43..ab6ac0c081 100644
--- a/ui/action-bar/action-bar.android.ts
+++ b/ui/action-bar/action-bar.android.ts
@@ -17,6 +17,27 @@ const ACTION_ITEM_ID_OFFSET = 1000;
 
 global.moduleMerge(common, exports);
 
+var trace: typeof traceModule;
+function ensureTrace() {
+    if (!trace) {
+        trace = require("trace");
+    }
+}
+
+var utils: typeof utilsModule;
+function ensureUtils() {
+    if (!utils) {
+        utils = require("utils/utils");
+    }
+}
+
+var imageSource: typeof imageSourceModule;
+function ensureImageSource() {
+    if (!imageSource) {
+        imageSource = require("image-source");
+    }
+}
+
 var actionItemIdGenerator = ACTION_ITEM_ID_OFFSET;
 function generateItemId(): number {
     actionItemIdGenerator++;
@@ -309,7 +330,7 @@ export class ActionBar extends common.ActionBar {
         if (this._toolbar && child._nativeView) {
             this._toolbar.removeView(child._nativeView);
 
-            var trace: typeof traceModule = require("trace");
+            ensureTrace();
 
             trace.notifyEvent(child, "childInLayoutRemovedFromNativeVisualTree");
         }
@@ -321,7 +342,7 @@ function getDrawableOrResourceId(icon: string, resources: android.content.res.Re
         return undefined;
     }
 
-    var utils: typeof utilsModule = require("utils/utils");
+    ensureUtils();
 
     if (icon.indexOf(utils.RESOURCE_PREFIX) === 0) {
         var resourceId: number = resources.getIdentifier(icon.substr(utils.RESOURCE_PREFIX.length), 'drawable', application.android.packageName);
@@ -332,7 +353,7 @@ function getDrawableOrResourceId(icon: string, resources: android.content.res.Re
     else {
         var drawable: android.graphics.drawable.BitmapDrawable;
 
-        var imageSource: typeof imageSourceModule = require("image-source");
+        ensureImageSource();
 
         var is = imageSource.fromFileOrResource(icon);
         if (is) {
diff --git a/ui/animation/animation-common.ts b/ui/animation/animation-common.ts
index 2272a4debb..e41930e28d 100644
--- a/ui/animation/animation-common.ts
+++ b/ui/animation/animation-common.ts
@@ -2,6 +2,13 @@
 import viewModule = require("ui/core/view");
 import * as traceModule from "trace";
 
+var trace: typeof traceModule;
+function ensureTrace() {
+    if (!trace) {
+        trace = require("trace");
+    }
+}
+
 export module Properties {
     export var opacity = "opacity";
     export var backgroundColor = "backgroundColor";
@@ -56,7 +63,7 @@ export class Animation implements definition.Animation {
             throw new Error("No animation definitions specified");
         }
 
-        var trace : typeof traceModule = require("trace");
+        ensureTrace();
 
         trace.write("Analyzing " + animationDefinitions.length + " animation definitions...", trace.categories.Animation);
         this._propertyAnimations = new Array<PropertyAnimation>();
diff --git a/ui/builder/builder.ts b/ui/builder/builder.ts
index cc4ff54bd1..d7f0b600ac 100644
--- a/ui/builder/builder.ts
+++ b/ui/builder/builder.ts
@@ -1,5 +1,4 @@
-import * as trace from "trace";
-import {debug, ScopeError, SourceError, Source} from "utils/debug";
+import {debug, ScopeError, SourceError, Source} from "utils/debug";
 import * as xml from "xml";
 import {View, Template} from "ui/core/view";
 import {File, path, knownFolders} from "file-system";
@@ -13,6 +12,13 @@ import * as traceModule from "trace";
 
 const defaultNameSpaceMatcher = /tns\.xsd$/i;
 
+var trace: typeof traceModule;
+function ensureTrace() {
+    if (!trace) {
+        trace = require("trace");
+    }
+}
+
 export function parse(value: string | Template, context: any): View {
     if (isString(value)) {
         var viewToReturn: View;
@@ -90,7 +96,7 @@ function loadCustomComponent(componentPath: string, componentName?: string, attr
         if (parentPage) {
             parentPage.addCssFile(cssFilePath);
         } else {
-            var trace: typeof traceModule = require("trace");
+            ensureTrace();
 
             trace.write("CSS file found but no page specified. Please specify page in the options!", trace.categories.Error, trace.messageType.error);
         }
diff --git a/ui/builder/component-builder.ts b/ui/builder/component-builder.ts
index de0ee391d3..9c2f32bfbb 100644
--- a/ui/builder/component-builder.ts
+++ b/ui/builder/component-builder.ts
@@ -27,6 +27,13 @@ var MODULES = {
 var CODEFILE = "codeFile";
 var CSSFILE = "cssFile";
 
+var platform: typeof platformModule;
+function ensurePlatform() {
+    if (!platform) {
+        platform = require("platform");
+    }
+}
+
 export function getComponentModule(elementName: string, namespace: string, attributes: Object, exports: Object): ComponentModule {
     var instance: View;
     var instanceModule: Object;
@@ -109,7 +116,7 @@ export function getComponentModule(elementName: string, namespace: string, attri
             if (attr.indexOf(":") !== -1) {
                 var platformName = attr.split(":")[0].trim();
 
-                var platform: typeof platformModule = require("platform");
+                ensurePlatform();
 
                 if (platformName.toLowerCase() === platform.device.os.toLowerCase()) {
                     attr = attr.split(":")[1].trim();
diff --git a/ui/button/button-common.ts b/ui/button/button-common.ts
index df471bf3c1..6a8ff535fe 100644
--- a/ui/button/button-common.ts
+++ b/ui/button/button-common.ts
@@ -7,6 +7,20 @@ import observable = require("data/observable");
 import * as weakEventListenerModule from "ui/core/weak-event-listener";
 import * as enumsModule from "ui/enums";
 
+var weakEvents: typeof weakEventListenerModule;
+function ensureWeakEvents() {
+    if (!weakEvents) {
+        weakEvents = require("ui/core/weak-event-listener");
+    }
+}
+
+var enums: typeof enumsModule;
+function ensureEnums() {
+    if (!enums) {
+        enums = require("ui/enums");
+    }
+}
+
 var textProperty = new dependencyObservable.Property(
     "text",
     "Button",
@@ -65,7 +79,7 @@ export class Button extends view.View implements definition.Button {
 
     set formattedText(value: formattedString.FormattedString) {
         if (this.formattedText !== value) {
-            var weakEvents: typeof weakEventListenerModule = require("ui/core/weak-event-listener");
+            ensureWeakEvents();
 
             if (this.formattedText) {
                 weakEvents.removeWeakEventListener(this.formattedText, observable.Observable.propertyChangeEvent, this.onFormattedTextChanged, this);
@@ -129,7 +143,7 @@ export class Button extends view.View implements definition.Button {
 
 function onTextWrapPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var v = <view.View>data.object;
-    var enums : typeof enumsModule = require("ui/enums");
+    ensureEnums();
 
     v.style.whiteSpace = data.newValue ? enums.WhiteSpace.normal : enums.WhiteSpace.nowrap;
 }
diff --git a/ui/content-view/content-view.ts b/ui/content-view/content-view.ts
index f141fe292a..7e794aec8a 100644
--- a/ui/content-view/content-view.ts
+++ b/ui/content-view/content-view.ts
@@ -1,6 +1,6 @@
 import definition = require("ui/content-view");
 import view = require("ui/core/view");
-import * as utilsModule from "utils/utils";
+import * as utils from "utils/utils";
 
 export class ContentView extends view.CustomLayoutView implements definition.ContentView, view.AddChildFromBuilder {
     private _content: view.View;
@@ -50,7 +50,6 @@ export class ContentView extends view.CustomLayoutView implements definition.Con
     // This method won't be called in Android because we use the native android layout.
     public onMeasure(widthMeasureSpec: number, heightMeasureSpec: number): void {
         var result = view.View.measureChild(this, this.content, widthMeasureSpec, heightMeasureSpec);
-        var utils: typeof utilsModule = require("utils/utils");
 
         var width = utils.layout.getMeasureSpecSize(widthMeasureSpec);
         var widthMode = utils.layout.getMeasureSpecMode(widthMeasureSpec);
diff --git a/ui/core/bindable.ts b/ui/core/bindable.ts
index 0a27ff69f4..762c97908e 100644
--- a/ui/core/bindable.ts
+++ b/ui/core/bindable.ts
@@ -11,13 +11,25 @@ import * as polymerExpressionsModule from "js-libs/polymer-expressions";
 import * as specialPropertiesModule from "ui/builder/special-properties";
 
 //late import
-var _appModule: typeof applicationModule = null;
+var application: typeof applicationModule;
+function ensureApplication() {
+    if (!application) {
+        application = require("application");
+    }
+}
+
+var expressions: typeof polymerExpressionsModule;
+function ensureExpressions() {
+    if (!expressions) {
+        expressions = require("js-libs/polymer-expressions");
+    }
+}
 
-function appModule() {
-    if (!_appModule) {
-        _appModule = require("application");
+var specialProperties: typeof specialPropertiesModule;
+function ensureSpecialProperties() {
+    if (!specialProperties) {
+        specialProperties = require("ui/builder/special-properties");
     }
-    return _appModule;
 }
 
 var bindingContextProperty = new dependencyObservable.Property(
@@ -364,15 +376,16 @@ export class Binding {
 
     private _getExpressionValue(expression: string, isBackConvert: boolean, changedModel: any): any {
         try {
-            var polymerExpressions: typeof polymerExpressionsModule = require("js-libs/polymer-expressions");
+            ensureExpressions();
 
-            var exp = polymerExpressions.PolymerExpressions.getExpression(expression);
+            var exp = expressions.PolymerExpressions.getExpression(expression);
             if (exp) {
                 var context = this.source && this.source.get && this.source.get() || global;
                 var model = {};
-                for (var prop in appModule().resources) {
-                    if (appModule().resources.hasOwnProperty(prop) && !context.hasOwnProperty(prop)) {
-                        context[prop] = appModule().resources[prop];
+                ensureApplication();
+                for (var prop in application.resources) {
+                    if (application.resources.hasOwnProperty(prop) && !context.hasOwnProperty(prop)) {
+                        context[prop] = application.resources[prop];
                     }
                 }
 
@@ -593,9 +606,9 @@ export class Binding {
                 optionsInstance.off(options.property, null, optionsInstance.bindingContext);
                 optionsInstance.on(options.property, value, optionsInstance.bindingContext);
             } else {
-                var sp: typeof specialPropertiesModule = require("ui/builder/special-properties");
+                ensureSpecialProperties();
 
-                let specialSetter = sp.getSpecialPropertySetter(options.property);
+                let specialSetter = specialProperties.getSpecialPropertySetter(options.property);
                 if (specialSetter) {
                     specialSetter(optionsInstance, value);
                 } else {
diff --git a/ui/core/control-state-change.ios.ts b/ui/core/control-state-change.ios.ts
index 055cb9d87d..d3f00e7ba0 100644
--- a/ui/core/control-state-change.ios.ts
+++ b/ui/core/control-state-change.ios.ts
@@ -1,6 +1,6 @@
 /* tslint:disable:no-unused-variable */
 import definition = require("ui/core/control-state-change");
-import * as visualStateConstantsModule from "ui/styling/visual-state-constants";
+import * as visualStateConstants from "ui/styling/visual-state-constants";
 
 var ObserverClass = NSObject.extend(
     {
@@ -50,8 +50,6 @@ export class ControlStateChangeListener implements definition.ControlStateChange
     }
 
     private _updateState() {
-        var visualStateConstants: typeof visualStateConstantsModule = require("ui/styling/visual-state-constants");
-
         var state = visualStateConstants.Normal;
         if (this._control.highlighted) {
             state = visualStateConstants.Pressed;
diff --git a/ui/core/proxy.ts b/ui/core/proxy.ts
index b902fb3cc6..1d7e8a6c65 100644
--- a/ui/core/proxy.ts
+++ b/ui/core/proxy.ts
@@ -1,9 +1,9 @@
 import bindable = require("ui/core/bindable");
 import dependencyObservable = require("ui/core/dependency-observable");
 import definition = require("ui/core/proxy");
-import * as platformModule from "platform";
-import * as typesModule from "utils/types";
-import * as observableModule from "data/observable";
+import * as platform from "platform";
+import * as types from "utils/types";
+import * as observable from "data/observable";
 
 export class PropertyMetadata extends dependencyObservable.PropertyMetadata implements definition.PropertyMetadata {
     private _onSetNativeValue: dependencyObservable.PropertyChangedCallback;
@@ -77,8 +77,6 @@ export class ProxyObject extends bindable.Bindable implements definition.ProxyOb
             return;
         }
 
-        var platform: typeof platformModule = require("platform");
-
         if (platform.device.os === platform.platformNames.android && !this.android) {
             // in android we have lazy loading and we do not have a native widget created yet, do not call the onSetNativeValue callback
             // properties will be synced when the widget is created
@@ -92,14 +90,10 @@ export class ProxyObject extends bindable.Bindable implements definition.ProxyOb
 
         var proxyMetadata = <PropertyMetadata>metadata;
         if (proxyMetadata.onSetNativeValue) {
-            var types: typeof typesModule = require("utils/types");
-
             if (types.isUndefined(newValue)) {
                 newValue = this._getValue(property);
             }
 
-            var observable: typeof observableModule = require("data/observable"); 
-
             proxyMetadata.onSetNativeValue({
                 object: this,
                 property: property,
diff --git a/ui/core/view-common.ts b/ui/core/view-common.ts
index e8701b9f39..9fe6f9898b 100644
--- a/ui/core/view-common.ts
+++ b/ui/core/view-common.ts
@@ -14,10 +14,24 @@ import {PropertyMetadata, ProxyObject} from "ui/core/proxy";
 import {PropertyMetadataSettings, PropertyChangeData, Property, ValueSource, PropertyMetadata as doPropertyMetadata} from "ui/core/dependency-observable";
 import {registerSpecialProperty} from "ui/builder/special-properties";
 import {CommonLayoutParams, nativeLayoutParamsProperty} from "ui/styling/style";
-import * as visualStateConstantsModule from "ui/styling/visual-state-constants";
+import * as visualStateConstants from "ui/styling/visual-state-constants";
 import * as bindableModule from "ui/core/bindable";
 import * as visualStateModule from "../styling/visual-state";
 
+var bindable: typeof bindableModule;
+function ensureBindable() {
+    if (!bindable) {
+        bindable = require("ui/core/bindable");
+    }
+}
+
+var visualState: typeof visualStateModule;
+function ensureVisualState() {
+    if (!visualState) {
+        visualState = require("../styling/visual-state");
+    }
+}
+
 registerSpecialProperty("class", (instance: definition.View, propertyValue: string) => {
     instance.className = propertyValue;
 });
@@ -181,9 +195,6 @@ export class View extends ProxyObject implements definition.View {
 
         this._style = new style.Style(this);
         this._domId = viewIdCounter++;
-
-        var visualStateConstants: typeof visualStateConstantsModule = require("ui/styling/visual-state-constants");
-
         this._visualState = visualStateConstants.Normal;
     }
 
@@ -1009,7 +1020,7 @@ export class View extends ProxyObject implements definition.View {
             view.onUnloaded();
         }
 
-        var bindable: typeof bindableModule = require("ui/core/bindable");
+        ensureBindable();
 
         view._setValue(bindable.Bindable.bindingContextProperty, undefined, ValueSource.Inherited);
         var inheritablePropertiesSetCallback = function (property: Property) {
@@ -1056,8 +1067,8 @@ export class View extends ProxyObject implements definition.View {
             return;
         }
         // we use lazy require to prevent cyclic dependencies issues
-        var vsm: typeof visualStateModule = require("ui/styling/visual-state");
-        this._visualState = vsm.goToState(this, state);
+        ensureVisualState();
+        this._visualState = visualState.goToState(this, state);
 
         // TODO: What state should we set here - the requested or the actual one?
         this._requestedVisualState = state;
diff --git a/ui/core/view.android.ts b/ui/core/view.android.ts
index 3f25ea7487..c0f98b18da 100644
--- a/ui/core/view.android.ts
+++ b/ui/core/view.android.ts
@@ -5,7 +5,7 @@ import utils = require("utils/utils");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
 import gestures = require("ui/gestures");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 import style = require("ui/styling/style");
 import styling = require("ui/styling");
 import enums = require("ui/enums");
@@ -403,8 +403,6 @@ export class CustomLayoutView extends View implements viewDefinition.CustomLayou
         super._addViewToNativeVisualTree(child);
 
         if (this._nativeView && child._nativeView) {
-            var types: typeof typesModule = require("utils/types");
-
             if (types.isNullOrUndefined(atIndex) || atIndex >= this._nativeView.getChildCount()) {
                 this._nativeView.addView(child._nativeView);
             }
diff --git a/ui/core/view.ios.ts b/ui/core/view.ios.ts
index c4725f048c..cd2d9bd3ea 100644
--- a/ui/core/view.ios.ts
+++ b/ui/core/view.ios.ts
@@ -8,6 +8,13 @@ import styling = require("ui/styling");
 import enums = require("ui/enums");
 import * as backgroundModule from "ui/styling/background";
 
+var background: typeof backgroundModule;
+function ensureBackground() {
+    if (!background) {
+        background = require("ui/styling/background");
+    }
+}
+
 global.moduleMerge(viewCommon, exports);
 
 function onAutomationTextPropertyChanged(data: dependencyObservable.PropertyChangeData) {
@@ -322,7 +329,7 @@ export class ViewStyler implements style.Styler {
     private static setBackgroundInternalProperty(view: View, newValue: any) {
         var nativeView: UIView = <UIView>view._nativeView;
         if (nativeView) {
-            var background: typeof backgroundModule = require("ui/styling/background");
+            ensureBackground();
             nativeView.backgroundColor = background.ios.createBackgroundUIColor(view);
         }
     }
diff --git a/ui/core/weak-event-listener.ts b/ui/core/weak-event-listener.ts
index 84a834d2c2..78321d2240 100644
--- a/ui/core/weak-event-listener.ts
+++ b/ui/core/weak-event-listener.ts
@@ -1,5 +1,5 @@
 import observable = require("data/observable");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 var handlersForEventName = new Map<string,(eventData: observable.EventData) => void>();
 var sourcesMap = new WeakMap<observable.Observable, Map<string, Array<TargetHandlerPair>>>();
@@ -62,8 +62,6 @@ function getHandlerForEventName(eventName: string): (eventData: observable.Event
 }
 
 function validateArgs(source: observable.Observable, eventName: string, handler: (eventData: observable.EventData) => void, target: any) {
-    var types: typeof typesModule = require("utils/types");
-
     if (types.isNullOrUndefined(source)) {
         throw new Error("source is null or undefined");
     }
diff --git a/ui/date-picker/date-picker.android.ts b/ui/date-picker/date-picker.android.ts
index 5eddeff2ad..e94427b7ff 100644
--- a/ui/date-picker/date-picker.android.ts
+++ b/ui/date-picker/date-picker.android.ts
@@ -2,7 +2,7 @@
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
 import utils = require("utils/utils")
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 function onYearPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var picker = <DatePicker>data.object;
@@ -35,8 +35,6 @@ function onDayPropertyChanged(data: dependencyObservable.PropertyChangeData) {
 (<proxy.PropertyMetadata>common.DatePicker.dayProperty.metadata).onSetNativeValue = onDayPropertyChanged;
 
 function updateNativeDate(picker: DatePicker) {
-    var types: typeof typesModule = require("utils/types");
-
     var year = types.isNumber(picker.year) ? picker.year : picker.android.getYear();
     var month = types.isNumber(picker.month) ? (picker.month - 1) : picker.android.getMonth();
     var day = types.isNumber(picker.day) ? picker.day : picker.android.getDayOfMonth();
diff --git a/ui/frame/frame-common.ts b/ui/frame/frame-common.ts
index 66118b906e..0243705825 100644
--- a/ui/frame/frame-common.ts
+++ b/ui/frame/frame-common.ts
@@ -3,12 +3,17 @@ import {View, CustomLayoutView} from "ui/core/view";
 import {Page} from "ui/page";
 import {isString, isFunction, isDefined} from "utils/types";
 import * as trace from "trace";
-import {load as buildModule} from "ui/builder";
-import {knownFolders, path} from "file-system";
 import {resolveFileName} from "file-system/file-name-resolver";
-import * as fileSystemModule from "file-system";
+import * as fs from "file-system";
 import * as builderModule from "ui/builder";
 
+var builder: typeof builderModule;
+function ensureBuilder() {
+    if (!builder) {
+        builder = require("ui/builder");
+    }
+}
+
 var frameStack: Array<Frame> = [];
 
 function buildEntryFromArgs(arg: any): definition.NavigationEntry {
@@ -58,12 +63,10 @@ export function resolvePageFromEntry(entry: definition.NavigationEntry): Page {
         }
     }
     else if (entry.moduleName) {
-        var fs: typeof fileSystemModule = require("file-system");
-
         // Current app full path.
-        var currentAppPath = knownFolders.currentApp().path;
+        var currentAppPath = fs.knownFolders.currentApp().path;
         //Full path of the module = current app full path + module name.
-        var moduleNamePath = path.join(currentAppPath, entry.moduleName);
+        var moduleNamePath = fs.path.join(currentAppPath, entry.moduleName);
 
         var moduleExports;
         if (global.moduleExists(entry.moduleName)) {
@@ -111,10 +114,10 @@ function pageFromBuilder(moduleNamePath: string, moduleExports: any): Page {
     if (fileName) {
         trace.write("Loading XML file: " + fileName, trace.categories.Navigation);
 
-        var builder: typeof builderModule = require("ui/builder");
+        ensureBuilder();
 
         // Or check if the file exists in the app modules and load the page from XML.
-        element = buildModule(fileName, moduleExports);
+        element = builder.load(fileName, moduleExports);
         if (element instanceof Page) {
             page = <Page>element;
         }
diff --git a/ui/frame/frame.android.ts b/ui/frame/frame.android.ts
index 6e8585cf89..0983cff886 100644
--- a/ui/frame/frame.android.ts
+++ b/ui/frame/frame.android.ts
@@ -4,7 +4,7 @@ import pages = require("ui/page");
 import trace = require("trace");
 import observable = require("data/observable");
 import application = require("application");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 import * as utilsModule from "utils/utils";
 
 global.moduleMerge(frameCommon, exports);
@@ -366,8 +366,6 @@ export class Frame extends frameCommon.Frame {
     }
 
     public _getNavBarVisible(page: pages.Page): boolean {
-        var types : typeof typesModule = require("utils/types");
-
         if (types.isDefined(page.actionBarHidden)) {
             return !page.actionBarHidden;
         }
diff --git a/ui/frame/frame.d.ts b/ui/frame/frame.d.ts
index 1a025bdd50..7c706800e7 100644
--- a/ui/frame/frame.d.ts
+++ b/ui/frame/frame.d.ts
@@ -248,6 +248,7 @@ declare module "ui/frame" {
     }
 
     //@private
-    export function reloadPage(): void;
+    function reloadPage(): void;
+    function resolvePageFromEntry(entry: NavigationEntry): pages.Page;
     //@endprivate
 }
\ No newline at end of file
diff --git a/ui/frame/frame.ios.ts b/ui/frame/frame.ios.ts
index 41f91a8458..0c7709a07b 100644
--- a/ui/frame/frame.ios.ts
+++ b/ui/frame/frame.ios.ts
@@ -6,7 +6,7 @@ import enums = require("ui/enums");
 import utils = require("utils/utils");
 import view = require("ui/core/view");
 import uiUtils = require("ui/utils");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 global.moduleMerge(frameCommon, exports);
 
@@ -147,8 +147,6 @@ export class Frame extends frameCommon.Frame {
             case enums.NavigationBarVisibility.auto:
                 let newValue: boolean;
 
-                var types: typeof typesModule = require("utils/types");
-
                 if (page && types.isDefined(page.actionBarHidden)) {
                     newValue = !page.actionBarHidden;
                 }
diff --git a/ui/html-view/html-view.ios.ts b/ui/html-view/html-view.ios.ts
index e5bf7b553a..9ecc020f9c 100644
--- a/ui/html-view/html-view.ios.ts
+++ b/ui/html-view/html-view.ios.ts
@@ -2,8 +2,8 @@
 import definition = require("ui/html-view");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
-import * as utilsModule from "utils/utils";
-import * as viewModule from "ui/core/view";
+import * as utils from "utils/utils";
+import * as view from "ui/core/view";
 
 function onHtmlPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var view = <HtmlView>data.object;
@@ -53,8 +53,6 @@ export class HtmlView extends common.HtmlView {
         var nativeView = this._nativeView;
         if (nativeView) {
 
-            var utils: typeof utilsModule = require("utils/utils");
-
             var width = utils.layout.getMeasureSpecSize(widthMeasureSpec);
             var widthMode = utils.layout.getMeasureSpecMode(widthMeasureSpec);
 
@@ -77,8 +75,6 @@ export class HtmlView extends common.HtmlView {
             var measureWidth = Math.max(labelWidth, this.minWidth);
             var measureHeight = Math.max(nativeSize.height, this.minHeight);
 
-            var view: typeof viewModule = require("ui/core/view");
-
             var widthAndState = view.View.resolveSizeAndState(measureWidth, width, widthMode, 0);
             var heightAndState = view.View.resolveSizeAndState(measureHeight, height, heightMode, 0);
 
diff --git a/ui/image-cache/image-cache.ios.ts b/ui/image-cache/image-cache.ios.ts
index 763ea9dabf..ae69221650 100644
--- a/ui/image-cache/image-cache.ios.ts
+++ b/ui/image-cache/image-cache.ios.ts
@@ -3,6 +3,13 @@ import utils = require("utils/utils");
 import trace = require("trace");
 import * as httpRequestModule from "http/http-request";
 
+var httpRequest: typeof httpRequestModule;
+function ensureHttpRequest() {
+    if (!httpRequest) {
+        httpRequest = require("http/http-request");
+    }
+}
+
 //class NSCacheDelegateImpl extends NSObject implements NSCacheDelegate {
 //    public static ObjCProtocols = [NSCacheDelegate];
 
@@ -65,7 +72,7 @@ export class Cache extends common.Cache {
     }
 
     public _downloadCore(request: common.DownloadRequest) {
-        var httpRequest: typeof httpRequestModule = require("http/http-request");
+        ensureHttpRequest();
 
         var that = this;
         httpRequest.request({ url: request.url, method: "GET" })
diff --git a/ui/image/image-common.ts b/ui/image/image-common.ts
index 28affba7cb..9bb5a57df5 100644
--- a/ui/image/image-common.ts
+++ b/ui/image/image-common.ts
@@ -7,7 +7,7 @@ import enums = require("ui/enums");
 import platform = require("platform");
 import utils = require("utils/utils");
 
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 var SRC = "src";
 var IMAGE_SOURCE = "imageSource";
@@ -23,8 +23,6 @@ function onSrcPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var image = <Image>data.object;
     var value = data.newValue;
 
-    var types: typeof typesModule = require("utils/types");
-
     if (types.isString(value)) {
         value = value.trim();
         image.imageSource = null;
diff --git a/ui/image/image.android.ts b/ui/image/image.android.ts
index b93852481e..7d77ab8653 100644
--- a/ui/image/image.android.ts
+++ b/ui/image/image.android.ts
@@ -11,13 +11,20 @@ import utils = require("utils/utils");
 
 global.moduleMerge(imageCommon, exports);
 
+var enums: typeof enumsModule;
+function ensureEnums() {
+    if (!enums) {
+        enums = require("ui/enums");
+    }
+}
+
 function onStretchPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var image = <Image>data.object;
     if (!image.android) {
         return;
     }
 
-    var enums: typeof enumsModule = require("ui/enums");
+    ensureEnums();
 
     switch (data.newValue) {
         case enums.Stretch.aspectFit:
diff --git a/ui/label/label-common.ts b/ui/label/label-common.ts
index 5a76d5894d..f6a117d7af 100644
--- a/ui/label/label-common.ts
+++ b/ui/label/label-common.ts
@@ -5,6 +5,13 @@ import textBase = require("ui/text-base");
 import view = require("ui/core/view");
 import * as enumsModule from "ui/enums";
 
+var enums: typeof enumsModule;
+function ensureEnums() {
+    if (!enums) {
+        enums = require("ui/enums");
+    }
+}
+
 export class Label extends textBase.TextBase implements definition.Label {
     public static textWrapProperty = new dependencyObservable.Property(
         "textWrap",
@@ -26,7 +33,7 @@ export class Label extends textBase.TextBase implements definition.Label {
 
 function onTextWrapPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var v = <view.View>data.object;
-    var enums: typeof enumsModule = require("ui/enums");
+    ensureEnums();
 
     v.style.whiteSpace = data.newValue ? enums.WhiteSpace.normal : enums.WhiteSpace.nowrap;
 }
diff --git a/ui/label/label.ios.ts b/ui/label/label.ios.ts
index ab7c0f0296..a833f02d33 100644
--- a/ui/label/label.ios.ts
+++ b/ui/label/label.ios.ts
@@ -1,7 +1,7 @@
 import common = require("./label-common");
 import definition = require("ui/label");
-import * as enumsModule from "ui/enums";
-import * as utilsModule from "utils/utils";
+import * as enums from "ui/enums";
+import * as utils from "utils/utils";
 import * as backgroundModule from "ui/styling/background";
 import view = require("ui/core/view");
 import style = require("ui/styling/style");
@@ -9,6 +9,13 @@ import styling = require("ui/styling");
 
 global.moduleMerge(common, exports);
 
+var background: typeof backgroundModule;
+function ensureBackground() {
+    if (!background) {
+        background = require("ui/styling/background");
+    }
+}
+
 class UILabelImpl extends UILabel {
 
     private _owner: WeakRef<Label>;
@@ -73,8 +80,6 @@ export class Label extends common.Label {
     public onMeasure(widthMeasureSpec: number, heightMeasureSpec: number): void {
         var nativeView = this._nativeView;
         if (nativeView) {
-            var utils: typeof utilsModule = require("utils/utils");
-
             var width = utils.layout.getMeasureSpecSize(widthMeasureSpec);
             var widthMode = utils.layout.getMeasureSpecMode(widthMeasureSpec);
 
@@ -92,8 +97,6 @@ export class Label extends common.Label {
             var nativeSize = nativeView.sizeThatFits(CGSizeMake(width, height));
             var labelWidth = nativeSize.width;
 
-            var enums: typeof enumsModule = require("ui/enums");
-
             if (!this.textWrap && this.style.whiteSpace !== enums.WhiteSpace.nowrap) {
                 labelWidth = Math.min(labelWidth, width);
             }
@@ -115,7 +118,7 @@ export class LabelStyler implements style.Styler {
         var uiLabel: UILabel = <UILabel>view._nativeView;
         if (uiLabel && uiLabel.layer) {
             var flipImage = true;
-            var background: typeof backgroundModule = require("ui/styling/background");
+            ensureBackground();
             var uiColor = <UIColor>background.ios.createBackgroundUIColor(view, flipImage);
             var cgColor = uiColor ? uiColor.CGColor : null;
             uiLabel.layer.backgroundColor = cgColor;
diff --git a/ui/layouts/grid-layout/grid-layout-common.ts b/ui/layouts/grid-layout/grid-layout-common.ts
index eaf81b9ac6..7a556c1d67 100644
--- a/ui/layouts/grid-layout/grid-layout-common.ts
+++ b/ui/layouts/grid-layout/grid-layout-common.ts
@@ -8,6 +8,13 @@ import {registerSpecialProperty} from "ui/builder/special-properties";
 import numberUtils = require("../../../utils/number-utils");
 import * as typesModule from "utils/types";
 
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
 function validateArgs(element: View): View {
     if (!element) {
         throw new Error("element cannot be null or undefinied.");
@@ -47,7 +54,7 @@ export class ItemSpec extends Bindable implements definition.ItemSpec {
 
         }
         else if (arguments.length === 2) {
-            var types: typeof typesModule = require("utils/types");
+            ensureTypes();
 
             if (types.isNumber(arguments[0]) && types.isString(arguments[1])) {
                 if (arguments[0] < 0 || (arguments[1] !== GridUnitType.auto && arguments[1] !== GridUnitType.star && arguments[1] !== GridUnitType.pixel)) {
diff --git a/ui/layouts/layout.android.ts b/ui/layouts/layout.android.ts
index 4390b5df2b..f055558a78 100644
--- a/ui/layouts/layout.android.ts
+++ b/ui/layouts/layout.android.ts
@@ -2,7 +2,7 @@
 import view = require("ui/core/view");
 import layoutBase = require("ui/layouts/layout-base");
 import trace = require("trace");
-import * as utilsModule from "utils/utils";
+import * as utils from "utils/utils";
 
 var OWNER = "_owner";
 
@@ -52,8 +52,6 @@ export class Layout extends layoutBase.LayoutBase implements definition.Layout {
 
         var view = this._nativeView;
         if (view) {
-            var utils: typeof utilsModule = require("utils/utils");
-
             var width = utils.layout.getMeasureSpecSize(widthMeasureSpec);
             var widthMode = utils.layout.getMeasureSpecMode(widthMeasureSpec);
 
diff --git a/ui/list-picker/list-picker.android.ts b/ui/list-picker/list-picker.android.ts
index 7497cf9194..496129e953 100644
--- a/ui/list-picker/list-picker.android.ts
+++ b/ui/list-picker/list-picker.android.ts
@@ -1,7 +1,7 @@
 import common = require("./list-picker-common");
 import dependencyObservable = require("ui/core/dependency-observable");
 import utils = require("utils/utils")
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 global.moduleMerge(common, exports);
 
@@ -71,8 +71,6 @@ export class ListPicker extends common.ListPicker {
 
     public _onSelectedIndexPropertyChanged(data: dependencyObservable.PropertyChangeData) {
         super._onSelectedIndexPropertyChanged(data);
-        var types: typeof typesModule = require("utils/types");
-
         if (this.android && types.isNumber(data.newValue)) {
             this.android.setValue(data.newValue);
         }
diff --git a/ui/list-picker/list-picker.ios.ts b/ui/list-picker/list-picker.ios.ts
index 949e367a51..315b04b807 100644
--- a/ui/list-picker/list-picker.ios.ts
+++ b/ui/list-picker/list-picker.ios.ts
@@ -1,6 +1,6 @@
 import common = require("./list-picker-common");
 import dependencyObservable = require("ui/core/dependency-observable");
-import * as typesModule from "utils/types";
+import * as types from "utils/types";
 
 global.moduleMerge(common, exports);
 
@@ -33,8 +33,6 @@ export class ListPicker extends common.ListPicker {
 
     public _onSelectedIndexPropertyChanged(data: dependencyObservable.PropertyChangeData) {
         super._onSelectedIndexPropertyChanged(data);
-        var types: typeof typesModule = require("utils/types");
-
         if (this.ios && types.isNumber(data.newValue)) {
             this.ios.selectRowInComponentAnimated(data.newValue, 0, false);
         }
diff --git a/ui/list-view/list-view-common.ts b/ui/list-view/list-view-common.ts
index ee063e5849..8a370473e9 100644
--- a/ui/list-view/list-view-common.ts
+++ b/ui/list-view/list-view-common.ts
@@ -9,6 +9,34 @@ import * as labelModule from "ui/label";
 import * as observableArrayModule from "data/observable-array";
 import * as weakEventsModule from "ui/core/weak-event-listener";
 
+var builder: typeof builderModule;
+function ensureBuilder() {
+    if (!builder) {
+        builder = require("ui/builder");
+    }
+}
+
+var label: typeof labelModule;
+function ensureLabel() {
+    if (!label) {
+        label = require("ui/label");
+    }
+}
+
+var observableArray: typeof observableArrayModule;
+function ensureObservableArray() {
+    if (!observableArray) {
+        observableArray = require("data/observable-array");
+    }
+}
+
+var weakEvents: typeof weakEventsModule;
+function ensureWeakEvents() {
+    if (!weakEvents) {
+        weakEvents = require("ui/core/weak-event-listener");
+    }
+}
+
 var ITEMS = "items";
 var ITEMTEMPLATE = "itemTemplate";
 var ISSCROLLING = "isScrolling";
@@ -129,11 +157,10 @@ export class ListView extends view.View implements definition.ListView {
     }
 
     public _getItemTemplateContent(index: number): view.View {
-        var v;
+        ensureBuilder();
 
+        var v;
         if (this.itemTemplate && this.items) {
-            var builder : typeof builderModule = require("ui/builder");
-
             v = builder.parse(this.itemTemplate, this);
         }
 
@@ -156,7 +183,7 @@ export class ListView extends view.View implements definition.ListView {
     }
 
     public _getDefaultItemContent(index: number): view.View {
-        var label: typeof labelModule = require("ui/label");
+        ensureLabel();
 
         var lbl = new label.Label();
         lbl.bind({
@@ -167,8 +194,8 @@ export class ListView extends view.View implements definition.ListView {
     }
 
     public _onItemsPropertyChanged(data: dependencyObservable.PropertyChangeData) {
-        var observableArray: typeof observableArrayModule = require("data/observable-array");
-        var weakEvents: typeof weakEventsModule = require("ui/core/weak-event-listener");
+        ensureObservableArray();
+        ensureWeakEvents();
 
         if (data.oldValue instanceof observable.Observable) {
             weakEvents.removeWeakEventListener(data.oldValue, observableArray.ObservableArray.changeEvent, this._onItemsChanged, this);
diff --git a/ui/list-view/list-view.android.ts b/ui/list-view/list-view.android.ts
index 241a393812..d5ab324bc5 100644
--- a/ui/list-view/list-view.android.ts
+++ b/ui/list-view/list-view.android.ts
@@ -6,9 +6,16 @@ import proxy = require("ui/core/proxy");
 import dependencyObservable = require("ui/core/dependency-observable");
 import definition = require("ui/list-view");
 import utils = require("utils/utils")
-import * as layoutBaseModule from "ui/layouts/layout-base";
+import * as layoutBase from "ui/layouts/layout-base";
 import * as colorModule from "color";
 
+var color: typeof colorModule;
+function ensureColor() {
+    if (!color) {
+        color = require("color");
+    }
+}
+
 var ITEMLOADING = common.ListView.itemLoadingEvent;
 var LOADMOREITEMS = common.ListView.loadMoreItemsEvent;
 var ITEMTAP = common.ListView.itemTapEvent;
@@ -22,7 +29,7 @@ function onSeparatorColorPropertyChanged(data: dependencyObservable.PropertyChan
         return;
     }
 
-    var color: typeof colorModule = require("color");
+    ensureColor();
 
     if (data.newValue instanceof color.Color) {
         bar.android.setDivider(new android.graphics.drawable.ColorDrawable(data.newValue.android));
@@ -222,8 +229,6 @@ function ensureListViewAdapterClass() {
                 }
                 this._listView._prepareItem(args.view, index);
                 if (!args.view.parent) {
-                    var layoutBase: typeof layoutBaseModule = require("ui/layouts/layout-base");
-
                     if (args.view instanceof layoutBase.LayoutBase) {
                         this._listView._addView(args.view);
                         convertView = args.view.android;
diff --git a/ui/list-view/list-view.ios.ts b/ui/list-view/list-view.ios.ts
index 2e2532c64f..5c978798c1 100644
--- a/ui/list-view/list-view.ios.ts
+++ b/ui/list-view/list-view.ios.ts
@@ -7,6 +7,13 @@ import proxy = require("ui/core/proxy");
 import dependencyObservable = require("ui/core/dependency-observable");
 import * as colorModule from "color";
 
+var color: typeof colorModule;
+function ensureColor() {
+    if (!color) {
+        color = require("color");
+    }
+}
+
 var CELLIDENTIFIER = "cell";
 var ITEMLOADING = common.ListView.itemLoadingEvent;
 var LOADMOREITEMS = common.ListView.loadMoreItemsEvent;
@@ -181,7 +188,7 @@ function onSeparatorColorPropertyChanged(data: dependencyObservable.PropertyChan
         return;
     }
 
-    var color: typeof colorModule = require("color");
+    ensureColor();
 
     if (data.newValue instanceof color.Color) {
         bar.ios.separatorColor = data.newValue.ios;
diff --git a/ui/page/page-common.ts b/ui/page/page-common.ts
index e801f90255..516f9f0baf 100644
--- a/ui/page/page-common.ts
+++ b/ui/page/page-common.ts
@@ -1,15 +1,28 @@
 import {ContentView} from "ui/content-view";
 import view = require("ui/core/view");
 import dts = require("ui/page");
-import frame = require("ui/frame");
 import styleScope = require("../styling/style-scope");
 import {ActionBar} from "ui/action-bar";
 import {DependencyObservable, PropertyMetadata, PropertyMetadataSettings, PropertyChangeData, Property, ValueSource} from "ui/core/dependency-observable";
-import * as styleModule from "../styling/style";
+import * as style from "../styling/style";
 import * as fileSystemModule from "file-system";
-import * as frameCommonModule from "../frame/frame-common";
+import * as frameModule from "ui/frame";
 import proxy = require("ui/core/proxy");
 
+var fs: typeof fileSystemModule;
+function ensureFS() {
+    if (!fs) {
+        fs = require("file-system");
+    }
+}
+
+var frame: typeof frameModule;
+function ensureFrame() {
+    if (!frame) {
+        frame = require("ui/frame");
+    }
+}
+
 // on Android we explicitly set propertySettings to None because android will invalidate its layout (skip unnecessary native call).
 var AffectsLayout = global.android ? PropertyMetadataSettings.None : PropertyMetadataSettings.AffectsLayout;
 
@@ -52,10 +65,8 @@ export class Page extends ContentView implements dts.Page {
     }
 
     public onLoaded() {
-        var sm: typeof styleModule = require("../styling/style");
-
         // The default style of the page should be white background
-        this.style._setValue(sm.backgroundColorProperty, "white", ValueSource.Inherited);
+        this.style._setValue(style.backgroundColorProperty, "white", ValueSource.Inherited);
 
         this._applyCss();
         
@@ -146,7 +157,7 @@ export class Page extends ContentView implements dts.Page {
 
     private _cssFiles = {};
     public addCssFile(cssFileName: string) {
-        var fs: typeof fileSystemModule = require("file-system");
+        ensureFS();
 
         if (cssFileName.indexOf("~/") === 0) {
             cssFileName = fs.path.join(fs.knownFolders.currentApp().path, cssFileName.replace("~/", ""));
@@ -163,8 +174,8 @@ export class Page extends ContentView implements dts.Page {
         }
     }
 
-    get frame(): frame.Frame {
-        return <frame.Frame>this.parent;
+    get frame(): frameModule.Frame {
+        return <frameModule.Frame>this.parent;
     }
 
     private createNavigatedData(eventName: string, isBackNavigation: boolean): dts.NavigatedData {
@@ -196,6 +207,7 @@ export class Page extends ContentView implements dts.Page {
     }
 
     public showModal() {
+        ensureFrame();
         if (arguments.length === 0) {
             this._showNativeModalView(<any>frame.topmost().currentPage, undefined, undefined, true);
         } else {
@@ -204,9 +216,7 @@ export class Page extends ContentView implements dts.Page {
             var closeCallback: Function = arguments[2];
             var fullscreen: boolean = arguments[3];
 
-            var frameCommon: typeof frameCommonModule = require("../frame/frame-common");
-
-            var page = frameCommon.resolvePageFromEntry({ moduleName: moduleName });
+            var page = frame.resolvePageFromEntry({ moduleName: moduleName });
             (<Page>page)._showNativeModalView(this, context, closeCallback, fullscreen);
         }
     }
diff --git a/ui/page/page.android.ts b/ui/page/page.android.ts
index 71271bb53c..827c6d6721 100644
--- a/ui/page/page.android.ts
+++ b/ui/page/page.android.ts
@@ -2,13 +2,27 @@
 import definition = require("ui/page");
 import view = require("ui/core/view");
 import enums = require("ui/enums");
-import * as actionBarModule from "ui/action-bar";
-import * as gridLayoutModule from "ui/layouts/grid-layout";
+import * as actionBar from "ui/action-bar";
+import * as gridLayout from "ui/layouts/grid-layout";
 import * as traceModule from "trace";
 import * as colorModule from "color";
 
 global.moduleMerge(pageCommon, exports);
 
+var trace: typeof traceModule;
+function ensureTrace() {
+    if (!trace) {
+        trace = require("trace");
+    }
+}
+
+var color: typeof colorModule;
+function ensureColor() {
+    if (!color) {
+        color = require("color");
+    }
+}
+
 var DialogFragmentClass;
 function ensureDialogFragmentClass() {
     if (DialogFragmentClass) {
@@ -87,16 +101,13 @@ export class Page extends pageCommon.Page {
     public _addViewToNativeVisualTree(child: view.View, atIndex?: number): boolean {
         // Set the row property for the child 
         if (this._nativeView && child._nativeView) {
-            var actionBar: typeof actionBarModule = require("ui/action-bar");
-            var grid: typeof gridLayoutModule = require("ui/layouts/grid-layout");
-
             if (child instanceof actionBar.ActionBar) {
-                grid.GridLayout.setRow(child, 0);
+                gridLayout.GridLayout.setRow(child, 0);
                 child.horizontalAlignment = enums.HorizontalAlignment.stretch;
                 child.verticalAlignment = enums.VerticalAlignment.top;
             }
             else {
-                grid.GridLayout.setRow(child, 1);
+                gridLayout.GridLayout.setRow(child, 1);
             }
         }
 
@@ -107,8 +118,7 @@ export class Page extends pageCommon.Page {
         var skipDetached = !force && this.frame.android.cachePagesOnNavigate && !this._isBackNavigation;
 
         if (skipDetached) {
-            var trace: typeof traceModule = require("trace");
-
+            ensureTrace();
             // Do not detach the context and android reference.
             trace.write("Caching Page " + this._domId, trace.categories.NativeLifecycle);
         }
@@ -128,8 +138,7 @@ export class Page extends pageCommon.Page {
     protected _showNativeModalView(parent: Page, context: any, closeCallback: Function, fullscreen?: boolean) {
         super._showNativeModalView(parent, context, closeCallback, fullscreen);
         if (!this.backgroundColor) {
-            var color: typeof colorModule = require("color");
-
+            ensureColor();
             this.backgroundColor = new color.Color("White");
         }
 
diff --git a/ui/repeater/repeater.ts b/ui/repeater/repeater.ts
index 0ef47754f3..27cf397970 100644
--- a/ui/repeater/repeater.ts
+++ b/ui/repeater/repeater.ts
@@ -6,13 +6,20 @@ import observable = require("data/observable");
 import layoutBaseModule = require("ui/layouts/layout-base");
 import utils = require("utils/utils");
 import trace = require("trace");
-import * as platformModule from "platform";
-import * as stackLayoutModule from "ui/layouts/stack-layout";
-import * as typesModule from "utils/types";
-import * as builderModule from "ui/builder";
+import * as platform from "platform";
+import * as stackLayout from "ui/layouts/stack-layout";
+import * as types from "utils/types";
+import * as builder from "ui/builder";
 import * as labelModule from "ui/label";
-import * as observableArrayModule from "data/observable-array";
-import * as weakEventListenerModule from "ui/core/weak-event-listener";
+import * as observableArray from "data/observable-array";
+import * as weakEvents from "ui/core/weak-event-listener";
+
+var label: typeof labelModule;
+function ensureLabel() {
+    if (!label) {
+        label = require("ui/label");
+    }
+}
 
 var ITEMS = "items";
 var ITEMTEMPLATE = "itemTemplate";
@@ -46,14 +53,10 @@ export class Repeater extends viewModule.CustomLayoutView implements definition.
     constructor() {
         super();
 
-        var platform: typeof platformModule = require("platform");
-
         if (platform.device.os === platform.platformNames.ios) {
             this._ios = UIView.new();
         }
 
-        var stackLayout: typeof stackLayoutModule = require("ui/layouts/stack-layout");
-
         this.itemsLayout = new stackLayout.StackLayout();
     }
 
@@ -131,14 +134,10 @@ export class Repeater extends viewModule.CustomLayoutView implements definition.
             this.itemsLayout.removeChildren();
         }
 
-        var types : typeof typesModule = require("utils/types");
-
         if (types.isNullOrUndefined(this.items) || !types.isNumber(this.items.length)) {
             return;
         }
 
-        var builder: typeof builderModule = require("ui/builder");
-
         var length = this.items.length;
         for (let i = 0; i < length; i++) {
             let viewToAdd = !types.isNullOrUndefined(this.itemTemplate) ? builder.parse(this.itemTemplate, this) : this._getDefaultItemContent(i);
@@ -153,9 +152,6 @@ export class Repeater extends viewModule.CustomLayoutView implements definition.
     }
 
     public _onItemsPropertyChanged(data: dependencyObservable.PropertyChangeData) {
-        var observableArray: typeof observableArrayModule = require("data/observable-array");
-        var weakEvents: typeof weakEventListenerModule = require("ui/core/weak-event-listener");
-
         trace.write(`Repeater._onItemsPropertyChanged(${data.oldValue} => ${data.newValue})`, "Repeater");
         if (data.oldValue instanceof observableArray.ObservableArray) {
             weakEvents.removeWeakEventListener(data.oldValue, observableArray.ObservableArray.changeEvent, this._onItemsChanged, this);
@@ -192,7 +188,7 @@ export class Repeater extends viewModule.CustomLayoutView implements definition.
     }
 
     public _getDefaultItemContent(index: number): viewModule.View {
-        var label: typeof labelModule = require("ui/label");
+        ensureLabel();
 
         var lbl = new label.Label();
         lbl.bind({
diff --git a/ui/search-bar/search-bar.android.ts b/ui/search-bar/search-bar.android.ts
index 0df8342ab9..4a4aa99540 100644
--- a/ui/search-bar/search-bar.android.ts
+++ b/ui/search-bar/search-bar.android.ts
@@ -9,6 +9,13 @@ import style = require("ui/styling/style");
 import view = require("ui/core/view");
 import font = require("ui/styling/font");
 
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
 var SEARCHTEXT = "searchText";
 var QUERY = "query";
 var EMPTY = "";
@@ -60,7 +67,7 @@ function onHintPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     }
 
     var newValue = data.newValue;
-    var types: typeof typesModule = require("utils/types");
+    ensureTypes();
 
     if (types.isString(newValue)) {
         bar.android.setQueryHint(newValue);
diff --git a/ui/search-bar/search-bar.ios.ts b/ui/search-bar/search-bar.ios.ts
index 8b03061c55..1ece867c52 100644
--- a/ui/search-bar/search-bar.ios.ts
+++ b/ui/search-bar/search-bar.ios.ts
@@ -7,6 +7,13 @@ import style = require("ui/styling/style");
 import view = require("ui/core/view");
 import font = require("ui/styling/font");
 
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
 function onTextPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var bar = <SearchBar>data.object;
     bar.ios.text = data.newValue;
@@ -48,7 +55,7 @@ function onHintPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     }
 
     var newValue = data.newValue;
-    var types: typeof typesModule = require("utils/types");
+    ensureTypes();
 
     if (types.isString(newValue)) {
         bar.ios.placeholder = newValue;
diff --git a/ui/segmented-bar/segmented-bar-common.ts b/ui/segmented-bar/segmented-bar-common.ts
index c1388d58e1..dc627e480f 100644
--- a/ui/segmented-bar/segmented-bar-common.ts
+++ b/ui/segmented-bar/segmented-bar-common.ts
@@ -6,6 +6,13 @@ import color = require("color");
 import bindable = require("ui/core/bindable");
 import * as typesModule from "utils/types";
 
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
 export module knownCollections {
     export var items = "items";
 }
@@ -40,7 +47,7 @@ export class SegmentedBar extends view.View implements definition.SegmentedBar {
     public _adjustSelectedIndex(items: Array<definition.SegmentedBarItem>) {
         if (this.items) {
             if (this.items.length > 0) {
-                var types: typeof typesModule = require("utils/types");
+                ensureTypes();
 
                 if (types.isUndefined(this.selectedIndex) || (this.selectedIndex > this.items.length - 1)) {
                     this._setValue(SegmentedBar.selectedIndexProperty, 0);
diff --git a/ui/segmented-bar/segmented-bar.ios.ts b/ui/segmented-bar/segmented-bar.ios.ts
index 4489b64d7b..83fd59520e 100644
--- a/ui/segmented-bar/segmented-bar.ios.ts
+++ b/ui/segmented-bar/segmented-bar.ios.ts
@@ -11,6 +11,13 @@ import view = require("ui/core/view");
 
 global.moduleMerge(common, exports);
 
+var color: typeof colorModule;
+function ensureColor() {
+    if (!color) {
+        color = require("color");
+    }
+}
+
 function onSelectedIndexPropertyChanged(data: dependencyObservable.PropertyChangeData) {
     var view = <SegmentedBar>data.object;
     if (!view.ios || !view.items) {
@@ -67,7 +74,7 @@ function onSelectedBackgroundColorPropertyChanged(data: dependencyObservable.Pro
         return;
     }
 
-    var color: typeof colorModule = require("color");
+    ensureColor();
 
     if (data.newValue instanceof color.Color) {
         view.ios.tintColor = data.newValue.ios;
diff --git a/ui/styling/background-common.ts b/ui/styling/background-common.ts
index b9ff613962..e21fd5f0be 100644
--- a/ui/styling/background-common.ts
+++ b/ui/styling/background-common.ts
@@ -5,6 +5,13 @@ import definition = require("ui/styling/background");
 import cssValue = require("css-value");
 import * as typesModule from "utils/types";
 
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
 interface CSSValue {
     type: string;
     string: string;
@@ -213,7 +220,7 @@ export class Background implements definition.Background {
     };
 
     public isEmpty(): boolean {
-        var types: typeof typesModule = require("utils/types");
+        ensureTypes();
 
         return types.isNullOrUndefined(this.image) && types.isNullOrUndefined(this.color);
     }
diff --git a/ui/styling/background.android.ts b/ui/styling/background.android.ts
index e200f9bb3c..311202a105 100644
--- a/ui/styling/background.android.ts
+++ b/ui/styling/background.android.ts
@@ -6,7 +6,18 @@ import types = require("utils/types");
 import * as styleModule from "./style";
 import * as buttonModule from "ui/button";
 
-var btn: typeof buttonModule;
+var button: typeof buttonModule;
+var style: typeof styleModule;
+
+function ensureLazyRequires() {
+    if (!button) {
+        button = require("ui/button");
+    }
+
+    if (!style) {
+        style = require("./style");
+    }
+}
 
 global.moduleMerge(common, exports);
 
@@ -164,24 +175,19 @@ export module ad {
     var _defaultBackgrounds = new Map<string, android.graphics.drawable.Drawable>();
 
     export function onBackgroundOrBorderPropertyChanged(v: view.View) {
-        if (!btn) {
-            btn = require("ui/button");
-        }
-
         var nativeView = <android.view.View>v._nativeView;
         if (!nativeView) {
             return;
         }
 
         ensureBorderDrawable();
-
-        var style: typeof styleModule = require("./style");
+        ensureLazyRequires();
 
         var backgroundValue = v.style._getValue(style.backgroundInternalProperty);
         var borderWidth = v.borderWidth;
         var bkg = <any>nativeView.getBackground();
 
-        if (v instanceof btn.Button && !types.isNullOrUndefined(bkg) && types.isFunction(bkg.setColorFilter) &&
+        if (v instanceof button.Button && !types.isNullOrUndefined(bkg) && types.isFunction(bkg.setColorFilter) &&
             v.borderWidth === 0 && v.borderRadius === 0 &&
             types.isNullOrUndefined(v.style._getValue(style.backgroundImageProperty)) &&
             !types.isNullOrUndefined(v.style._getValue(style.backgroundColorProperty))) {
@@ -193,7 +199,7 @@ export module ad {
             if (!(bkg instanceof BorderDrawableClass)) {
                 bkg = new BorderDrawableClass();
                 let viewClass = types.getClass(v);
-                if (!(v instanceof btn.Button) && !_defaultBackgrounds.has(viewClass)) {
+                if (!(v instanceof button.Button) && !_defaultBackgrounds.has(viewClass)) {
                     _defaultBackgrounds.set(viewClass, nativeView.getBackground());
                 }
 
@@ -216,7 +222,7 @@ export module ad {
         }
         else {
             // reset the value with the default native value
-            if (v instanceof btn.Button) {
+            if (v instanceof button.Button) {
                 var nativeButton = new android.widget.Button(nativeView.getContext());
                 nativeView.setBackground(nativeButton.getBackground());
             }
diff --git a/ui/styling/background.ios.ts b/ui/styling/background.ios.ts
index 25c4a2c02e..fb087c0df0 100644
--- a/ui/styling/background.ios.ts
+++ b/ui/styling/background.ios.ts
@@ -4,14 +4,19 @@ import * as styleModule from "./style";
 
 global.moduleMerge(common, exports);
 
+var style: typeof styleModule;
+function ensureStyle() {
+    if (!style) {
+        style = require("./style");
+    }
+}
+
 export module ios {
     export function createBackgroundUIColor(view: viewModule.View, flip?: boolean): UIColor {
         if(!view._nativeView){
             return undefined;
         }
 
-        var style: typeof styleModule = require("./style");
-
         var background = <common.Background> view.style._getValue(style.backgroundInternalProperty);
 
         if (!background || background.isEmpty()) {
diff --git a/ui/styling/css-selector.ts b/ui/styling/css-selector.ts
index edd7f5e9ab..cb917cca45 100644
--- a/ui/styling/css-selector.ts
+++ b/ui/styling/css-selector.ts
@@ -1,8 +1,8 @@
 import view = require("ui/core/view");
 import observable = require("ui/core/dependency-observable");
 import cssParser = require("css");
-import * as traceModule from "trace";
-import * as stylePropertyModule from "ui/styling/style-property";
+import * as trace from "trace";
+import * as styleProperty from "ui/styling/style-property";
 
 var ID_SPECIFICITY = 10000;
 var CLASS_SPECIFICITY = 100;
@@ -39,8 +39,6 @@ export class CssSelector {
                 view.style._setValue(property, value, observable.ValueSource.Css);
             }
             catch (ex) {
-                var trace : typeof traceModule = require("trace");
-
                 trace.write("Error setting property: " + property.name + " view: " + view + " value: " + value + " " + ex, trace.categories.Style, trace.messageType.error);
             }
         });
@@ -52,8 +50,6 @@ export class CssSelector {
             let name = declaration.property;
             let resolvedValue = declaration.value;
 
-            var styleProperty: typeof stylePropertyModule = require("ui/styling/style-property");
-
             let property = styleProperty.getPropertyByCssName(name);
 
             if (property) {                
diff --git a/ui/styling/font-common.ts b/ui/styling/font-common.ts
index fc74df84a2..86e26f729c 100644
--- a/ui/styling/font-common.ts
+++ b/ui/styling/font-common.ts
@@ -1,6 +1,6 @@
 import enums = require("ui/enums");
 import definitios = require("ui/styling/font");
-import * as convertersModule from "./converters";
+import * as converters from "./converters";
 
 export class Font implements definitios.Font {
     public static default = undefined;
@@ -102,7 +102,6 @@ export class Font implements definitios.Font {
 
     public static parse(cssValue: string): Font {
         var parsed = parseFont(cssValue);
-        var converters: typeof convertersModule = require("./converters");
 
         var size = converters.fontSizeConverter(parsed.fontSize);
         size = !!size ? size : undefined;
diff --git a/ui/styling/font.android.ts b/ui/styling/font.android.ts
index b44d80e50d..6f012b1695 100644
--- a/ui/styling/font.android.ts
+++ b/ui/styling/font.android.ts
@@ -5,6 +5,34 @@ import * as typesModule from "utils/types";
 import * as traceModule from "trace";
 import * as fileSystemModule from "file-system";
 
+var application: typeof applicationModule;
+function ensureApplication() {
+    if (!application) {
+        application = require("application");
+    }
+}
+
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
+var trace: typeof traceModule;
+function ensureTrace() {
+    if (!trace) {
+        trace = require("trace");
+    }
+}
+
+var fs: typeof fileSystemModule;
+function ensureFS() {
+    if (!fs) {
+        fs = require("file-system");
+    }
+}
+
 var typefaceCache = new Map<string, android.graphics.Typeface>();
 var appAssets: android.content.res.AssetManager;
 var FONTS_BASE_PATH = "/fonts/";
@@ -88,21 +116,22 @@ export class Font extends common.Font {
     }
 
     private loadFontFromFile(fontFamily: string): android.graphics.Typeface {
-        var application: typeof applicationModule = require("application");
+        ensureApplication();
 
         appAssets = appAssets || application.android.context.getAssets();
         if (!appAssets) {
             return null;
         }
 
-        var types: typeof typesModule = require("utils/types");
+        ensureTypes();
 
         var result = typefaceCache.get(fontFamily);
         // Check for undefined explicitly as null mean we tried to load the font, but failed.
         if (types.isUndefined(result)) {
             result = null;
-            var trace: typeof traceModule = require("trace");
-            var fs: typeof fileSystemModule  = require("file-system");
+
+            ensureTrace();
+            ensureFS();
 
             var fontAssetPath: string;
             var basePath = fs.path.join(fs.knownFolders.currentApp().path, "fonts", fontFamily);
diff --git a/ui/styling/style-scope.ts b/ui/styling/style-scope.ts
index aaad8098fd..3d62076120 100644
--- a/ui/styling/style-scope.ts
+++ b/ui/styling/style-scope.ts
@@ -8,6 +8,34 @@ import * as utilsModule from "utils/utils";
 import * as fileSystemModule from "file-system";
 import * as visualStateModule from "./visual-state";
 
+var types: typeof typesModule;
+function ensureTypes() {
+    if (!types) {
+        types = require("utils/types");
+    }
+}
+
+var utils: typeof utilsModule;
+function ensureUtils() {
+    if (!utils) {
+        utils = require("utils/utils");
+    }
+}
+
+var fs: typeof fileSystemModule;
+function ensureFS() {
+    if (!fs) {
+        fs = require("file-system");
+    }
+}
+
+var vs: typeof visualStateModule;
+function ensureVisualState() {
+    if (!vs) {
+        vs = require("./visual-state");
+    }
+}
+
 var pattern: RegExp = /('|")(.*?)\1/;
 
 export class StyleScope {
@@ -69,7 +97,7 @@ export class StyleScope {
 
     public static createSelectorsFromImports(tree: cssParser.SyntaxTree): cssSelector.CssSelector[] {
         var selectors = new Array<cssSelector.CssSelector>();
-        var types : typeof typesModule = require("utils/types");
+        ensureTypes();
 
         if (!types.isNullOrUndefined(tree)) {
             var imports = tree["stylesheet"]["rules"].filter(r=> r.type === "import");
@@ -81,10 +109,10 @@ export class StyleScope {
                 var url = match && match[2];
 
                 if (!types.isNullOrUndefined(url)) {
-                    var utils: typeof utilsModule = require("utils/utils");
+                    ensureUtils();
 
                     if (utils.isFileOrResourcePath(url)) {
-                        var fs: typeof fileSystemModule = require("file-system");
+                        ensureFS();
 
                         var fileName = types.isString(url) ? url.trim() : "";
                         if (fileName.indexOf("~/") === 0) {
@@ -183,7 +211,7 @@ export class StyleScope {
             stateSelector: cssSelector.CssVisualStateSelector;
 
         this._statesByKey[key] = allStates;
-        var vs: typeof visualStateModule = require("./visual-state");
+        ensureVisualState();
 
         for (i = 0; i < matchedStateSelectors.length; i++) {
             stateSelector = matchedStateSelectors[i];
diff --git a/ui/styling/style.ts b/ui/styling/style.ts
index ed244a0ec0..91c193277b 100644
--- a/ui/styling/style.ts
+++ b/ui/styling/style.ts
@@ -15,6 +15,13 @@ import platform = require("platform");
 import definition = require("ui/styling/style");
 import * as imageSourceModule from "image-source";
 
+var imageSource: typeof imageSourceModule;
+function ensureImageSource() {
+    if (!imageSource) {
+        imageSource = require("image-source");
+    }
+}
+
 // key is the property id and value is Dictionary<string, StylePropertyChangedHandler>;
 var _registeredHandlers = Array<Object>();
 
@@ -279,7 +286,7 @@ function onBackgroundImagePropertyChanged(data: PropertyChangeData) {
             url = match[2];
         }
 
-        var imageSource: typeof imageSourceModule = require("image-source");
+        ensureImageSource();
 
         if (utils.isDataURI(url)) {
             var base64Data = url.split(",")[1];
diff --git a/ui/styling/visual-state.ts b/ui/styling/visual-state.ts
index 48c3729720..7e4f3613e9 100644
--- a/ui/styling/visual-state.ts
+++ b/ui/styling/visual-state.ts
@@ -1,7 +1,7 @@
 import viewModule = require("ui/core/view");
 import observable = require("ui/core/dependency-observable");
 import styleProperty = require("ui/styling/style-property");
-import * as visualStateConstantsModule from "ui/styling/visual-state-constants";
+import * as visualStateConstants from "ui/styling/visual-state-constants";
 
 export class VisualState {
     private _setters: {};
@@ -39,9 +39,7 @@ export function goToState(view: viewModule.View, state: string): string {
     // Step 1
     if (!(state in allStates)) {
         // TODO: Directly go to normal?
-        var constants: typeof visualStateConstantsModule = require("ui/styling/visual-state-constants");
-
-        state = constants.Normal;
+        state = visualStateConstants.Normal;
     }
 
     // Step 2
diff --git a/ui/switch/switch.ios.ts b/ui/switch/switch.ios.ts
index ec4672a5ee..f08ba111e3 100644
--- a/ui/switch/switch.ios.ts
+++ b/ui/switch/switch.ios.ts
@@ -1,7 +1,7 @@
 import common = require("./switch-common");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
-import * as utilsModule from "utils/utils";
+import * as utils from "utils/utils";
 import styling = require("ui/styling");
 import style = require("ui/styling/style");
 import view = require("ui/core/view");
@@ -59,8 +59,7 @@ export class Switch extends common.Switch {
         let nativeSize = this._nativeView.sizeThatFits(CGSizeMake(0, 0));
         this.width = nativeSize.width;
         this.height = nativeSize.height;
-        var utils: typeof utilsModule = require("utils/utils");
-
+        
         let widthAndState = utils.layout.makeMeasureSpec(nativeSize.width, utils.layout.EXACTLY);
         let heightAndState = utils.layout.makeMeasureSpec(nativeSize.height, utils.layout.EXACTLY);
         this.setMeasuredDimension(widthAndState, heightAndState);
diff --git a/ui/tab-view/tab-view.android.ts b/ui/tab-view/tab-view.android.ts
index 7a7c1579c5..aa495e1206 100644
--- a/ui/tab-view/tab-view.android.ts
+++ b/ui/tab-view/tab-view.android.ts
@@ -7,10 +7,17 @@ import types = require("utils/types");
 import utils = require("utils/utils");
 import proxy = require("ui/core/proxy");
 import color = require("color");
-import * as imageSourceModule from "image-source";
 import style = require("ui/styling/style");
 import font = require("ui/styling/font");
 import styling = require("ui/styling");
+import * as imageSourceModule from "image-source";
+
+var imageSource: typeof imageSourceModule;
+function ensureImageSource() {
+    if (!imageSource) {
+        imageSource = require("image-source");
+    }
+}
 
 var VIEWS_STATES = "_viewStates";
 var ACCENT_COLOR = "colorAccent";
@@ -316,7 +323,7 @@ export class TabView extends common.TabView {
                 result.iconId = utils.ad.resources.getDrawableId(item.iconSource.substr(utils.RESOURCE_PREFIX.length));
             }
             else {
-                var imageSource: typeof imageSourceModule = require("image-source");
+                ensureImageSource();
 
                 var is = imageSource.fromFileOrResource(item.iconSource);
                 if (is) {
diff --git a/ui/tab-view/tab-view.ios.ts b/ui/tab-view/tab-view.ios.ts
index 3f5dedce18..943382d5cc 100644
--- a/ui/tab-view/tab-view.ios.ts
+++ b/ui/tab-view/tab-view.ios.ts
@@ -14,6 +14,13 @@ import styling = require("ui/styling");
 
 global.moduleMerge(common, exports);
 
+var imageSource: typeof imageSourceModule;
+function ensureImageSource() {
+    if (!imageSource) {
+        imageSource = require("image-source");
+    }
+}
+
 class UITabBarControllerImpl extends UITabBarController {
 
     private _owner: WeakRef<TabView>;
@@ -240,7 +247,7 @@ export class TabView extends common.TabView {
         var image: UIImage;
         image = this._iconsCache[iconSource];
         if (!image) {
-            var imageSource: typeof imageSourceModule = require("image-source");
+            ensureImageSource();
 
             var is = imageSource.fromFileOrResource(iconSource);
             if (is && is.ios) {
diff --git a/ui/text-base/text-base.ts b/ui/text-base/text-base.ts
index ed8f619d96..4461af9566 100644
--- a/ui/text-base/text-base.ts
+++ b/ui/text-base/text-base.ts
@@ -7,6 +7,13 @@ import formattedString = require("text/formatted-string");
 import * as weakEventListenerModule from "ui/core/weak-event-listener";
 import tbs = require("ui/text-base/text-base-styler");
 
+var weakEvents: typeof weakEventListenerModule;
+function ensureWeakEvents() {
+    if (!weakEvents) {
+        weakEvents = require("ui/core/weak-event-listener");
+    }
+}
+
 var textProperty = new dependencyObservable.Property(
     "text",
     "TextBase",
@@ -76,7 +83,7 @@ export class TextBase extends view.View implements definition.TextBase, formatte
 
     set formattedText(value: formattedString.FormattedString) {
         if (this.formattedText !== value) {
-            var weakEvents: typeof weakEventListenerModule = require("ui/core/weak-event-listener");
+            ensureWeakEvents();
 
             if (this.formattedText) {
                 weakEvents.removeWeakEventListener(this.formattedText, observable.Observable.propertyChangeEvent, this.onFormattedTextChanged, this);
diff --git a/ui/utils.ios.ts b/ui/utils.ios.ts
index 7d698349d5..3380f94e73 100644
--- a/ui/utils.ios.ts
+++ b/ui/utils.ios.ts
@@ -1,5 +1,5 @@
 import {View} from "ui/core/view";
-import * as utilsModule from "utils/utils";
+import * as utils from "utils/utils";
 
 export module ios {
     export function getActualHeight(view: UIView): number {
@@ -35,8 +35,6 @@ export module ios {
             superViewRotationRadians = atan2f(superview.transform.b, superview.transform.a);
         }
 
-        var utils: typeof utilsModule = require("utils/utils");
-
         if (utils.ios.MajorVersion < 8 && utils.ios.isLandscape() && !superViewRotationRadians) {
             // in iOS 7 when in landscape we switch width with height because on device they don't change even when rotated.
             width = size.height;
diff --git a/ui/web-view/web-view-common.ts b/ui/web-view/web-view-common.ts
index 430dc9e35b..fbee78f03d 100644
--- a/ui/web-view/web-view-common.ts
+++ b/ui/web-view/web-view-common.ts
@@ -2,10 +2,17 @@
 import view = require("ui/core/view");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
-import * as utilsModule from "utils/utils";
-import * as traceModule from "trace";
+import * as utils from "utils/utils";
+import * as trace from "trace";
 import * as fileSystemModule from "file-system";
 
+var fs: typeof fileSystemModule;
+function ensureFS() {
+    if (!fs) {
+        fs = require("file-system");
+    }
+}
+
 var urlProperty = new dependencyObservable.Property(
     "url",
     "WebView",
@@ -38,15 +45,13 @@ function onSrcPropertyChanged(data: dependencyObservable.PropertyChangeData) {
         return;
     }
 
-    webView.stopLoading();
-    var trace: typeof traceModule = require("trace");
+    webView.stopLoading();    
 
     var src = <string>data.newValue;
     trace.write("WebView._loadSrc(" + src + ")", trace.categories.Debug);
-    var utils: typeof utilsModule = require("utils/utils");
 
     if (utils.isFileOrResourcePath(src)) {
-        var fs: typeof fileSystemModule = require("file-system");
+        ensureFS();
 
         if (src.indexOf("~/") === 0) {
             src = fs.path.join(fs.knownFolders.currentApp().path, src.replace("~/", ""));
diff --git a/ui/web-view/web-view.android.ts b/ui/web-view/web-view.android.ts
index 9db1c93fde..7d702d0440 100644
--- a/ui/web-view/web-view.android.ts
+++ b/ui/web-view/web-view.android.ts
@@ -4,6 +4,13 @@ import * as fileSystemModule from "file-system";
 
 global.moduleMerge(common, exports);
 
+var fs: typeof fileSystemModule;
+function ensureFS() {
+    if (!fs) {
+        fs = require("file-system");
+    }
+}
+
 var WebViewClientClass;
 function ensureWebViewClientClass() {
     if (WebViewClientClass) {
@@ -130,7 +137,7 @@ export class WebView extends common.WebView {
             return;
         }
 
-        var fs: typeof fileSystemModule = require("file-system");
+        ensureFS();
 
         var baseUrl = `file:///${fs.knownFolders.currentApp().path}/`;
         this._android.loadDataWithBaseURL(baseUrl, src, "text/html", "utf-8", null);
diff --git a/utils/utils.android.ts b/utils/utils.android.ts
index 5133c65bb6..3db726aff5 100644
--- a/utils/utils.android.ts
+++ b/utils/utils.android.ts
@@ -4,6 +4,13 @@ import enums = require("ui/enums");
 
 global.moduleMerge(common, exports);
 
+var trace: typeof traceModule;
+function ensureTrace() {
+    if (!trace) {
+        trace = require("trace");
+    }
+}
+
 export module layout {
     var density = -1;
     var metrics: android.util.DisplayMetrics;
@@ -234,7 +241,7 @@ export module ad {
                 }
             }
             catch (ex) {
-                var trace: typeof traceModule = require("trace");
+                ensureTrace();
 
                 trace.write("Cannot get pallete color: " + name, trace.categories.Error, trace.messageType.error);
             }