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The irony here is UV is written in Rust.

That's not exactly for slowness reasons. The creators of uv have stated that if pip followed the same algorithms they'd see similar performance benefits. People greatly overstate the Python performance penalty.

... Actually, could you show me where they said it? I've been explaining it from first principles from a while now and it would be nice to be able to go "but don't take my word for it" as well.

(Python does incur a hefty performance penalty for things that are actually CPU bound. But that doesn't describe most of the process of installing Python packages; and the main part that is CPU bound is implemented by CPython in C.)

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