AI Insight Log

Mar 30, 2026 · Frontend Development

How Pure Math Eliminates DOM Layout Thrashing and Solves AI UI Lag

Pretext, a TypeScript library by React core contributor Cheng Lou, replaces costly DOM‑based text measurement with pure‑math calculations, cutting layout reflows from hundreds to zero and reducing measurement time from 30 ms to 0.05 ms, enabling precise UI layouts for AI‑driven interfaces.