PEP 836: JIT Go Brrr: The Path to a Supported JIT Compiler for CPython

The experimental Just-in-Time (JIT) compiler has been part of CPython’s main branch since Python 3.13. PEP 744 described part of its initial design and explicitly deferred a number of questions about the JIT’s long-term status. Since then, the JIT has been re-architected and matured considerably. In Python 3.15, it delivers a measurable, reproducible speedup over the interpreter (about 4-12%…