maybe? #1399

Job	Run time
macos-latest: clang++ Release Threads	28m 29s
macos-latest: clang++ Release OneTBB	4m 3s
macos-latest: clang++ Release PaRSEC	9m 25s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	29m 17s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 40s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	3m 10s
macos-latest: clang++ Debug Threads	29m 18s
macos-latest: clang++ Debug OneTBB	4m 1s
macos-latest: clang++ Debug PaRSEC	4m 10s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	34m 7s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 55s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 29s
	2h 34m 4s

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