Python 3.13 introduced an experimental copy-and-patch JIT compiler. In October 2024, this feature was experimental and often disabled by default. By November 2025, Python 3.13.1 solidifies the JIT as a stable, opt-in feature that shows measurable performance gains.

: Continuous efforts to improve Python's performance are expected, potentially including further optimizations to the just-in-time (JIT) compiler, PGO (Profile-Guided Optimization), and other areas.

What’s your experience with 3.13.1 so far? Run into any no-GIL weirdness? Share below. 🐍⚡

Initial benchmarks in late 2024 showed a modest 2-5% improvement over Python 3.12. However, the 3.13.1 patch release includes optimizations to the JIT's intermediate representation (IR).