Comments moved to https://news.ycombinator.com/item?id=45524702.

> And this is a bit disappointing. At least for this test, the JIT interpreter did not produce any significant performance gains, so much that I had to double and triple check that I used a correctly built interpreter with this feature enabled. I do not know much about the internals of the new JIT compiler, but I'm wondering if it cannot deal with this heavily recursive function.

FWIW one thing that is worth calling out here is that the initial goal for JIT right now in Python is getting it relatively stable, functional, and more or less getting the initial implementation out there. It's not surprising at all that it's not faster.

I say this because I think the teams working on free-threaded and JIT python maybe could have done a better job publicly setting expectations.

Pi-thon.