pip vs uv: Faster Python Installs in CI?
uv (from Astral) reimplements the pip workflow in Rust, and in CI the install-speed difference is hard to ignore.
pip is the standard Python installer bundled with Python. uv is a Rust-based tool that offers a fast pip-compatible installer plus project, lockfile, and Python-version management.
| pip | uv | |
|---|---|---|
| Implementation | Python | Rust |
| Install speed | Baseline | Much faster (often 10x+) |
| Resolver | Backtracking | Fast resolver |
| Lockfile | None native (pip-tools) | uv.lock (project mode) |
| Python version management | No | Yes (can install Pythons) |
In CI
uv installs and resolves dependencies far faster than pip, shortening the slowest part of many Python pipelines, and can install the Python interpreter itself to remove a setup step. uv also offers a drop-in pip interface (uv pip install) so you can adopt it for speed without changing your project layout. pip remains the universal default that every tool documents.
Cache it either way
Cache the wheel/download cache keyed on your requirements lock. Both run on standard CI runners; if installs dominate your job time, uv plus faster managed runners is the bigger lever.
The verdict
Want the fastest installs and optional Python management: uv (its pip interface makes adoption easy). Want the universal, zero-dependency default: pip. Test resolution if you have complex constraints before switching.