Adding on to the other comment, multiprocessing is also kinda broken on Linux/Mac.

1. Because global objects are refcounted, CoW effectively isn't a thing on Linux. They did add a way to avoid this [0], but you have to manually call it once your main imports are done.

2. On Mac, turns out a lot of the system libs aren't actually fork-safe [1]. Since these get imported inadvertently all the time, Python on Mac actually uses `spawn` [2] -- so it's roughly as slow as on Windows.

I haven't worked in Python in a couple years, but handling concurrency while supporting the major OSes was a goddamn mess and a half.

[0]: https://docs.python.org/3.12/library/gc.html#gc.freeze

[1]: https://bugs.python.org/issue33725

[2]: https://docs.python.org/3.12/library/multiprocessing.html#co...