Topic/prefactorization #33

Job	Run time
clang-format	9s
build (ubuntu-20.04, Debug, gcc)	2m 36s
build (ubuntu-20.04, Debug, clang)	2m 25s
build (ubuntu-20.04, RelWithDebInfo, gcc)	6m 33s
build (ubuntu-20.04, RelWithDebInfo, clang)	2m 6s
build (ubuntu-22.04, Debug, gcc)	2m 43s
build (ubuntu-22.04, Debug, clang)	2m 32s
build (ubuntu-22.04, RelWithDebInfo, gcc)	5m 26s
build (ubuntu-22.04, RelWithDebInfo, clang)	2m 29s
build (macos-latest, Debug, gcc)	1m 50s
build (macos-latest, RelWithDebInfo, gcc)	1m 36s
build (windows-latest, Debug, gcc)	15m 54s
build (windows-latest, RelWithDebInfo, gcc)	13m 57s
	1h 0m 16s

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