How fast is Python 3.15?
Summary
This blog post analyzes Python 3.15 performance via informal benchmarks against 3.10–3.14, PyPy, Node.js, and Rust, using fibo.py and bubble.py in single- and multi-threaded modes. It finds Python 3.15 offers only small performance gains over 3.14 in most tests, with the JIT variant showing the most notable improvements and free-threading offering gains primarily in multi-threaded scenarios. The author cautions against production use of the JIT until it leaves the experimental phase and shares a cautious upgrade stance.