Python is written in C too, what’s your point?

The point is that eliminating the GIL mainly benefits pure Python code. Numpy is already multithreaded.

I think you may have forgotten what we’re talking about.

the new python version was less than 50 lines and was developed in an afternoon, the c++ version was closing in on 1000 lines over 6 files.

That’s a bit suss too tbh. Did the C++ version use an existing library like Eigen too or did they implement everything from scratch?