Story
We rewrote our Rust WASM Parser in TypeScript – and it got 3x Faster
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Overview
OpenUI is rewriting its openui-lang parser from Rust to TypeScript to improve latency in converting a custom DSL emitted by an LLM into a React component tree. The original Rust-based parser utilized a six-stage pipeline but was found to be optimizing the wrong aspects for performance.
Summary from openui.com.
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Community reactions
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Hacker News · openui.com
Hacker News discussion ↗
Historical count: 5 · 5 saved in sample · Historical sample
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Based on 5 sampled comments from this thread. Analyzed 2026-03-21.
- Praise: The algorithmic improvement from O(N²) to O(N) through statement-level caching significantly enhances user-perceived latency, showcasing the importance of optimization beyond language choice.
- Praise: Rewriting the code allowed for the application of better practices and rectification of previous design flaws, emphasizing that thoughtful engineering can yield substantial performance gains.