I had Claude Fable 5.1 port markdown-it to Rust and WebAssembly. Same HTML byte for byte, about 10x faster. All 11,005 MDN pages render in 120 ms, against markdown-it's 1.2 s.
npm i mdust-rs https://github.com/younes-io/mdustGitHubGitHub - younes-io/mdust: Markdown to HTML in WebAssembly, byte-identical to markdown-itMarkdown to HTML in WebAssembly, byte-identical to markdown-it - younes-io/mdust
commit 99b9d15