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Quoting Ken Jin

Simon Willison's Blog / 3/18/2026

📰 NewsDeveloper Stack & InfrastructureSignals & Early Trends
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Key Points

  • Ken Jin states that Python 3.15’s JIT is back on track, achieving performance goals earlier than expected for macOS AArch64 and Linux x86_64.
  • The 3.15 alpha JIT is about 11-12% faster than the tail‑calling interpreter on macOS AArch64.
  • It is about 5-6% faster than the standard interpreter on x86_64 Linux.
  • This post on Simon Willison’s blog documents progress of CPython’s JIT project as of March 17, 2026.
  • The cited source is Ken Jin’s post, indicating continued improvements to CPython performance.
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17th March 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% faster on macOS AArch64 than the tail calling interpreter, and 5-6%faster than the standard interpreter on x86_64 Linux.

— Ken Jin, Python 3.15’s JIT is now back on track

Posted 17th March 2026 at 9:48 pm

This is a quotation collected by Simon Willison, posted on 17th March 2026.

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