A Plan for 5-10%* Faster Free-Threaded Jit by Python 3.16 – Ken Jin
Postedabout 2 months agoActiveabout 2 months ago
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PythonJitPerformance Optimization
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The post proposes a plan to achieve a 5-10% performance improvement in Python 3.16's free-threaded JIT, but the HN community expresses skepticism about the significance of this gain, comparing it unfavorably to alternatives like PyPy.
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Nov 13, 2025 at 12:53 PM EST
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Any way you slice it, this is unimpressive. The effort spent on making CPython jit-able seems entirely unjustified if this is the rate of progress we can expect. Especially given that PyPy has existed for over half of Python's lifetime now.