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The Deploy Log | Tools and products

Python precompiled bytecode

Vercel now compiles Python functions to bytecode at build time, and cold starts for the median-sized function dropped from 2.8 seconds to 1.3 seconds in benchmarks.

Vercel | In Edition 44, Saturday 25 Jul 2026

SOURCE Vercel, Python function bundles now include precompiled bytecode

Added to The Deploy Log Tuesday 15 Sep 2026, updated Thursday 17 Sep 2026. Read Edition 44, the edition that carried it.

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