CPython 3.13 was released two weeks ago and this release is the most performance-oriented in some time. After a quick read of the release notes, a few things stand out for the impact they can have on the performance: CPython can now run in free-threaded mode, with the global interpreter lock (GIL) disabled a brand new just-in-time (JIT) compiler has been added CPython now bundles the mimalloc allocator out of the box Let's focus on the free-threaded mode in this article to see how to leverage th...