A bit tighter #1485

Job	Run time
macos-latest: clang++ Release Threads	19m 24s
macos-latest: clang++ Release OneTBB	3m 43s
macos-latest: clang++ Release PaRSEC	4m 13s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	25m 47s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 57s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	3m 17s
macos-latest: clang++ Debug Threads	29m 48s
macos-latest: clang++ Debug OneTBB	4m 8s
macos-latest: clang++ Debug PaRSEC	4m 11s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	25m 28s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 29s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	3m 3s
	2h 8m 28s

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