EVERYTHING YOU NEED TO KNOW ABOUT PYTHON 3.13 – JIT AND GIL WENT UP THE HILL

Summary from the TLDR Web Dev newsletter

Python 3.13 (officially releasing on October 1) introduces two major changes: a "free-threaded" version that allows disabling the Global Interpreter Lock (GIL), potentially boosting multi-threaded performance, and experimental Just-in-Time (JIT) compilation, which could improve performance over time. The GIL removal addresses Python's limitations in fully utilizing multi-core processors, while the JIT compiler promises to optimize code execution by generating machine code on the fly.