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Python 3.15 adds lazy imports and faster experimental JIT execution

python.org 4 min read Editor score 8/10

Python 3.15 adds explicit lazy imports and reports experimental JIT gains of 7–8% on x86-64 Linux and 11–12% on AArch64 macOS. Engineers can assess the startup and runtime changes against their workloads.

What

Python 3.15.0 is a major release with interpreter, standard-library, typing, and C API changes.

How

New features include explicit lazy imports; the experimental JIT improved performance by 7–8% on x86-64 Linux over the standard interpreter.

Why it matters

Lazy imports target faster startup, while the JIT and C API changes offer engineers new performance and observability options.

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