@liambraus: CLAUDE CODE TAKES 3.4 SECONDS TO START UP. THIS ONE DOES IT IN 14 MILLISECONDS. A single developer just built their own…
Summary
A single developer built a code agent harness in Rust that starts up 245 times faster than Claude Code (14 ms vs 3.4 s) and uses up to 20x less RAM, achieving 10.4k stars on GitHub.
View Cached Full Text
Cached at: 07/25/26, 06:01 AM
CLAUDE CODE TAKES 3.4 SECONDS TO START UP. THIS ONE DOES IT IN 14 MILLISECONDS.
A single developer just built their own code agents harness, faster than everything you’re already using.
→ Starts up 245 times faster than Claude Code → Uses up to 20 times less RAM → Runs multiple agents in parallel without stepping on each other → Human-like memory between sessions
It’s not a fork. It’s a complete rewrite, in Rust, measuring every millisecond.
10.4k stars, free, open source.
Repo below.
Similar Articles
@_vmlops: HERE'S THE HARNESS THAT MAKES CLAUDE CODE 25X FASTER Most devs use claude code raw. this repo wraps it in a full plan →…
A new open-source harness called claude-code-harness wraps Claude Code in a structured plan-work-review-commit loop, using a Go-native engine to achieve 25x faster performance, and includes guardrails to prevent destructive operations.
Claude Code uses Bun written in Rust now
Claude Code, Anthropic's AI code assistant, has started using a Rust port of Bun as its JavaScript runtime, resulting in a 10% startup improvement on Linux, though the change went largely unnoticed. The article confirms the use of Bun v1.4.0 in the Claude Code binary via embedded Rust source files.
@ridark_eth: THIS GUY GAVE CLAUDE CODE 4 MINUTES AND IT STARTED BUILDING A $2K CLIENT PROJECT BY ITSELF one task at a time and one f…
A developer demonstrates how Claude Code autonomously builds a $2K client project in minutes by reading the repo, editing files, and fixing errors, turning what used to take a weekend into a few hours.
@L1vsun: i spent 3 months building the most optimized claude code setup possible it was running worse than day one 23 plugins, 8…
A developer shares that after spending 3 months over-optimizing a Claude code setup with 23 plugins and multiple frameworks, performance was worse than day one; deleting almost everything dramatically improved results, emphasizing that a minimal setup often works best.
Claude Code uses Bun written in Rust now
Claude Code v2.1.181+ uses the Rust port of Bun, resulting in a 10% faster startup on Linux. Evidence shows it ships with a preview version of Bun v1.4.0.