uv split into 14 crates for 30-40% faster incremental builds; do long Rust links hurt agents?
dsp_ · x · 2026-10-15
- charliermarsh (author of ruff/uv) shared that Cargo compiles independent crates in parallel and skips unaffected ones; splitting uv's primary crate from 46k lines into 14 crates (6k lines each) sped up incremental builds by 30-40%.
- dsp pushes back: Rust's long compile and especially link times may be a long-term problem for coding agents, since slow builds hurt agent iteration loops.
- Practical takeaway for agent coding workflows: crate granularity is a real lever for shortening agent feedback cycles.
Related event: uv Split Into 14 Crates, Cutting Incremental Build Time 30–43%(3 posts)→
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