Why is pytest slower on Windows?

[prjemian]

Side note: At this point (HEAD: 9b653a5) the run time of pytest from the project's root takes much (~3x) longer on Windows 10 than Linux. Same environment installation (bluesky_2022_1). Why?

time, s	# tests	OS	hardware details
149.3	152	Win 10	CPU: Dual Core Intel Core i7-1065G7 (-MCP-) speed: 1498 MHz
58.75	152	Linux Mint 20	(guest VM on above) CPU: Dual Core Intel Core i7-1065G7 (-MCP-) speed: 1498 MHz
48.5	152	Linux Mint 20.1	CPU: Quad Core Intel Core i5-7600 (-MCP-) speed/min/max: 910/800/4100

• 9b653a5 - (HEAD -> 162-NXDL-Manager, origin/162-NXDL-Manager) TST #163 (12 hours ago)

Observe that it's not just a difference in the CPU speed.

Originally posted by @prjemian in https://github.com/prjemian/punx/pull/163#issuecomment-971752029