We rewrote our Rust WASM parser in TypeScript and it got faster

A team rewrote their Rust WASM parser in TypeScript and achieved a surprising 15% performance boost, scoring 135 points and upending conventional wisdom. This counterintuitive result proves that language choice alone doesn’t guarantee speed—optimization tailored to the runtime can outperform the typical low-level approach. Compared to #1 OpenCode’s dominance in AI coding, this story illustrates a niche but powerful lesson: sometimes the right tool is the one you deeply optimize, not the one with inherent prestige.