build

General mostly performance-neutral improvements #394

Job	Run time
ci (Release, linux gnu-10)	2m 7s
ci (Release, linux clang-12)	1m 40s
ci (Release, linux nvhpc-21.9)	14m 40s
ci (Release, linux intel-classic)	4m 32s
ci (Release, macos)	4m 5s
ci (Debug, linux gnu-10)	3m 21s
ci (Debug, linux clang-12)	1m 47s
ci (Debug, linux nvhpc-21.9)	17m 50s
ci (Debug, linux intel-classic)	5m 36s
ci (Debug, macos)	3m 48s
	59m 26s

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