Multi-threading attempt III #494

Job	Run time
Julia 1 - ubuntu-latest -	1h 22m 8s
Julia 1 - macOS-latest -	24m 48s
Julia 1 - windows-latest -	1h 32m 41s
Julia lts - ubuntu-latest -	1h 19m 3s
Julia lts - macOS-latest -	16m 56s
Julia lts - windows-latest -	1h 26m 39s
Julia nightly - ubuntu-latest -	49m 18s
Julia nightly - macOS-latest -	32m 11s
Julia nightly - windows-latest -	54m 25s
	8h 38m 9s

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