Python 3.13 gets a JIT. “In late December 2023 (Christmas Day to be precise), CPython core developer Brandt Bucher submitted a little pull-request to the Python 3.13 branch adding a JIT compiler.”
Anthony Shaw does a deep dive into this new experimental JIT, explaining how it differs from other JITs. It’s an implementation of a copy-and-patch JIT, an idea that only emerged in 2021. This makes it architecturally much simpler than a traditional JIT, allowing it to compile faster and take advantage of existing LLVM tools on different architectures.
So far it’s providing a 2-9% performance improvement, but the real impact will be from the many future optimizations it enables.
Recent articles
- Large Language Models can run tools in your terminal with LLM 0.26 - 27th May 2025
- Highlights from the Claude 4 system prompt - 25th May 2025
- Live blog: Claude 4 launch at Code with Claude - 22nd May 2025