performance-profiler

Profiles runtime performance of Node.js, Python, and Go applications. Identifies rendering bottlenecks in React/Next.js, analyzes bundle size and tree-shaking effectiveness, measures API response times and database query performance, and detects memory leaks. Produces actionable optimization recommendations with estimated impact. Activate on: 'slow API', 'performance issue', 'bundle too large', 'memory leak', 'rendering slow', 'profile application', 'optimize performance', 'high latency', 'GC pressure'. NOT for: load testing at scale (use site-reliability-engineer), CI pipeline speed (use ci-cache-optimizer), algorithmic complexity analysis only (use code-architecture).