The author makes this point, too, and I agree it’s the most surprising thing abo... | Hacker News

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		twoodfin 11 months ago \| parent \| context \| favorite \| on: Performance of the Python 3.14 tail-call interpret... The author makes this point, too, and I agree it’s the most surprising thing about the entire scenario. LLVM introduced a major CPython performance regression, and nobody noticed for six months?

ltfish 11 months ago [–]

As far as I am aware, the official CPython binaries on Linux have always been built using GCC, so you will have to build your own CPython using both Clang 18 and 19 to notice the speed difference. I think this is partly why no one has noticed the speed difference yet.

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