--- title: Update on the CPython JIT: What to expect in 3.15 -... description: [EuroPython 2026 - S1 on 2026-07-15] 🎤 *Update on the CPython JIT: What to expect in 3.15 by Diego Russo* 🔗... canonical: https://daily.dev/posts/update-on-the-cpython-jit-what-to-expect-in-3-15---diego-russo-mifnn5kze twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Update on the CPython JIT: What to expect in 3.15 - Diego Russo | daily.dev og:description: [EuroPython 2026 - S1 on 2026-07-15] 🎤 *Update on the CPython JIT: What to expect in 3.15 by Diego Russo* 🔗... og:url: https://daily.dev/posts/update-on-the-cpython-jit-what-to-expect-in-3-15---diego-russo-mifnn5kze og:image: https://api.daily.dev/og/posts/MIfnN5kZE.png og:image:alt: Update on the CPython JIT: What to expect in 3.15 - Diego Russo og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Update on the CPython JIT: What to expect in 3.15 - Diego Russo **[EuroPython Conference](https://daily.dev/sources/europython)** · 33 min read · 0 upvotes · 0 comments ## Summary [EuroPython 2026 - S1 on 2026-07-15] 🎤 *Update on the CPython JIT: What to expect in 3.15 by Diego Russo* 🔗 https://ep2026.europython.eu/session/update-on-the-cpython-jit-what-to-expect-in-3-15 📝 Abstract: This talk is a follow-up to my EuroPython 2025 session on the foundations of the CPython JIT compiler. It looks at how the JIT has evolved since Python 3.14 and where it stands as Python 3.15 approaches release. We cover the transition of the JIT from an experimental feature towards a supported part of CPython, how it fits into the runtime today, and what that means in practice for users and distributors. The talk also explores how the JIT interacts with free-threaded builds, the current status of integration with external debuggers, and how these constraints shape real-world usage. Finally, we examine how the JIT performs today, where it already delivers substantial speedups, where it does not, and what realistic performance expectations look like for Python 3.15. --- This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License: https://creativecommons.org/licenses/by-nc-sa/4.0/ ## Full article daily.dev links to this article rather than hosting it. 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