Python 3.15’s JIT is now back on track

Ken Jin's Blog Python 3.15’s JIT is now back on track 17 Mar 2026 (JIT performance as of 17 March (PST). Lower is better versus interpreter. Image credits to https://doesjitgobrrr.com/). 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

[shib_ats]

https://note.com/shibats/n/nb57493c1d289 [python]

[misshiki]

Python 3.15のCPython JITは目標軌道に復帰。macOS AArch64で11～12%、x86_64 Linuxで5～6%高速化。トレース型フロントエンドや参照カウント最適化、コミュニティ主導開発が前進を支えた。