build

General mostly performance-neutral improvements #400

Job	Run time
ci (Release, linux gnu-10)	2m 40s
ci (Release, linux clang-12)	1m 49s
ci (Release, linux nvhpc-21.9)	14m 41s
ci (Release, linux intel-classic)	4m 38s
ci (Release, macos)	3m 53s
ci (Debug, linux gnu-10)	3m 29s
ci (Debug, linux clang-12)	2m 3s
ci (Debug, linux nvhpc-21.9)	17m 14s
ci (Debug, linux intel-classic)	5m 51s
ci (Debug, macos)	3m 13s
	59m 31s

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