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Quoting Ken Jin

By Simon Willison's Weblog March 17, 2026 · Edited March 17, 2026
Great news—we’ve hit our (very modest) performance goals for the CPython JIT over a year early for macOS AArch64, and a few months early for x86_64 Linux. The 3.15 alpha JIT is about 11-12%

Great news—we’ve hit our (very modest) performance goals for the CPython JIT over a year early for macOS AArch64, and a few months early for x86_64 Linux. The 3.15 alpha JIT is about 11-12% faster on macOS AArch64 than the tail calling interpreter, and 5-6%faster than the standard interpreter on x86_64 Linux.

— Ken Jin (https://fidget-spinner.github.io/posts/jit-on-track.html), Python 3.15’s JIT is now back on track

Tags: python (https://simonwillison.net/tags/python)
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