Tests

Optimize parallel workers start-up (#21203) #660

Job	Run time
Test mypyc suite with 32-bit Python	9m 40s
Test suite with py310-ubuntu, mypyc-compiled	16m 36s
Test suite with py314t-ubuntu, mypyc-compiled	20m 3s
Test suite with py312-ubuntu	9m 16s
Formatting and code style with Black + ruff	2m 3s
Test suite with py314-windows-64	27m 38s
mypyc runtime tests with py313-macos	4m 32s
Parallel tests with py314-windows-64, interpreted	9m 27s
Test suite with py311-ubuntu	8m 47s
Test suite with py314-ubuntu, mypyc-compiled	15m 35s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 18s
Test suite with py313-ubuntu, mypyc-compiled	15m 33s
Type check our own code (py310-ubuntu)	1m 36s
mypyc runtime tests with py310-ubuntu	6m 27s
Type check our own code (py310-windows-64)	2m 45s
Parallel tests with py314-ubuntu, interpreted	23m 27s
	3h 19m 43s

Provide feedback