I've been frustrated with querySelectorAll performance in high-frequency scenarios for a while. On large DOMs (10k+ nodes) with 50–100 queries/second — think virtual DOM diffing, live dashboards, design tools — it becomes a real bottleneck. So I built AQE (Atomic Quantum Engine): a CSS selector engine that replaces tree traversal with flat, memory-mapped bitwise operations. HOW IT WORKS Every DOM node gets a 64-bit BigInt bitmask. Each CSS token (tag, .class, #id, [attr], pseudo-class) maps to a unique bit position. Matching a selector becomes a single integer AND: (nodeMask & targetMask) === targetMask No string parsing. No tree climbing. No attribute iteration at query time.…