use LinearSolve precs setup #37

Job	Run time
test (Core, min, ubuntu-latest)	45m 50s
test (Core, min, macos-latest)	53m 18s
test (Core, min, windows-latest)	53m 15s
test (Core, 1, ubuntu-latest)	50m 39s
test (Core, 1, macos-latest)	1h 31m 42s
test (Core, 1, windows-latest)	55m 7s
test (Downstream, min, ubuntu-latest)	11m 7s
test (Downstream, min, macos-latest)	7m 13s
test (Downstream, min, windows-latest)	15m 28s
test (Downstream, 1, ubuntu-latest)	10m 5s
test (Downstream, 1, macos-latest)	7m 58s
test (Downstream, 1, windows-latest)	13m 56s
test (Misc, min, ubuntu-latest)	13m 48s
test (Misc, min, macos-latest)	8m 50s
test (Misc, min, windows-latest)	18m 40s
test (Misc, 1, ubuntu-latest)	12m 59s
test (Misc, 1, macos-latest)	8m 22s
test (Misc, 1, windows-latest)	18m 18s
test (Wrappers, min, ubuntu-latest)	11m 41s
test (Wrappers, min, macos-latest)	7m 59s
test (Wrappers, min, windows-latest)	16m 37s
test (Wrappers, 1, ubuntu-latest)	10m 44s
test (Wrappers, 1, macos-latest)	6m 53s
test (Wrappers, 1, windows-latest)	14m 0s
	9h 24m 29s

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