Comprehensive performance analysis and optimization for algorithms (O(n²)→O(n)), databases (N+1 queries, indexes), React (memoization, virtual lists), bundles (code splitting), API caching, and memory leaks. 85%+ improvement rate. Use when application is slow, response times exceed SLA, high CPU/memory usage, performance budgets needed, or when user mentions 'performance', 'slow', 'optimization', 'bottleneck', 'speed up', 'latency', 'memory leak', or 'performance tuning'.
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checklists/performance-checklist.mdexamples/INDEX.mdexamples/algorithm-optimization.mdexamples/backend-optimization.mdexamples/caching-optimization.mdexamples/database-optimization.mdexamples/frontend-optimization.mdreference/INDEX.mdreference/optimization-patterns.mdreference/performance-metrics.mdreference/profiling-tools.mdtemplates/INDEX.mdtemplates/optimization-report.mdtemplates/performance-test.js