Dae ChoiNotes on distributed systems, performance engineering, and ML infrastructure.https://daechoi.com/I rewrote tiktoken in Rust and found three bottlenecks hiding at three layers of the stackhttps://daechoi.com/blog/riptoken/https://daechoi.com/blog/riptoken/A SIMD regex fast path, pool contention on a hidden DFA cache, and compile-time DFAs that kill cold-start. The story of riptoken.Tue, 21 Apr 2026 00:00:00 GMT