pnpm 12 speeds up package installs up to 90% after Rust rewrite

pnpm 12 arrives as a fully backward-compatible update, according to lead maintainer Zoltan Kochan, who emphasizes that existing commands, flags, settings and lockfile format are preserved. Benchmarks published by the project indicate that installing an uncached package now takes 5.19 seconds, a notable improvement over the 8.22 seconds required by pnpm 11 and the 47.7 seconds needed by npm. The team also introduced pnpr, a Rust-implemented registry server, which cut the same installation down to 3.37 seconds.

Development began in April, resulting in a codebase that is roughly two-thirds Rust and one-third TypeScript. Sarah Gooding of Socket highlighted that package installation involves metadata fetching, tarball unpacking, dependency resolution and linking, making it well suited for native code and parallel execution. The rewrite reflects a broader trend of moving performance-critical JavaScript tooling into Rust.