Firehose

Claude Code now uses a Rust port of Bun, resulting in a 10% faster startup on Linux, with the exact version being v1.4.0, which is a preview of an unreleased version from the original Bun repository. The use of the Rust port is confirmed by finding Rust source files in the Claude Code installation, and a recent commit to the package.json file also supports this version. This change is not yet reflected in a tagged release outside of the canary channel. AI summary