> FYI: The extraction of files is largely python code that doesn't release the GIL. (cf. the zipfile class from the python interpreter has large layers of abstraction with a massive overhead in python code).

TIL. I ran some benchmarks and confirmed this is the case for many small files as you'd see in wheels — the GIL is released in a meaningful way for larger files though. Thanks!

> This might not give the same result for uv though.

Yeah, I built a prototype and ran some benchmarks. It makes a big difference if the entire wheel is empty files but for any real world examples it's within noise of the baseline.