Simon Willison • 12/27/2025

How uv got so fast

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This article explores the technical reasons behind the high speed of the uv Python package installer. It details key optimizations like using HTTP range requests to fetch only necessary metadata from wheel files and packing version numbers into compact u64 integers for fast comparisons, explaining how these design choices contribute to significant performance gains over traditional tools like pip.

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#Python #performance optimization #rust
How uv got so fast

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