Use concrete types when possible for improved performance #897

Job	Run time
pr_build / macOS Universal (Debug)	4m 27s
pr_build / win-x64 (Debug)	8m 3s
pr_build / macOS Universal (Release)	4m 10s
pr_build / linux-x64 (Debug)	4m 32s
pr_build / linux-arm64 (Debug)	2m 52s
pr_build / osx-x64 (Debug)	4m 41s
pr_build / win-x64 (Release)	7m 24s
pr_build / linux-x64 (Release)	4m 51s
pr_build / linux-arm64 (Release)	2m 50s
pr_build / osx-x64 (Release)	5m 39s
	49m 29s

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