Analyzes React DevTools Profiler exports, Chrome DevTools Performance traces, and Chrome heap snapshots / heap-timelines / heap-profiles. Identifies the highest-impact bottlenecks (long tasks, expensive renders, layout thrash, wasted memoisation, blocking scripts, retained memory, leaks) and proposes concrete code fixes ranked by measured impact. Auto-detects the input format (React `.json` profile, Chrome trace `.json` / `.cpuprofile`, or `.heapsnapshot` / `.heaptimeline` / `.heapprofile`). Iterates via the `/confidence` skill — if root-cause certainty is below 90%, it digs deeper before recommending a fix. Use when handed a profile file, asked "why is this slow?", "why is memory growing?", or asked to optimise a hot path with evidence. Triggers on "analyze profile", "react profiler", "chrome performance", "optimize from profile", "profile this", "why is this slow", "memory leak", "heap snapshot", "/profile-optimizer".