Python 3.13 introduced an exciting new feature that should be a real game-changer for the language’s overall performance — the ability to disable GIL. In this post, I’ll explain what this means and…

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Python 3.13 introduces the ability to disable the Global Interpreter Lock (GIL), allowing true parallelism within a single Python process. Benchmarks demonstrate significant performance improvements with this feature, although it adds some overhead to single-threaded processes. The free-threaded mode remains experimental and may require updates to C extensions and careful maintenance of thread-safety.

Python Now Supports True Parallelism. Is It Really That Good?