performancelisted

# Performance Skills ## Overview Performance optimization knowledge for building fast, scalable applications that provide excellent user experience. ## Key Metrics | Metric | Target | Description | |--------|--------|-------------| | **TTFB** | < 200ms | Time to First Byte | | **FCP** | < 1.8s | First Contentful Paint | | **LCP** | < 2.5s | Largest Contentful Paint | | **FID** | < 100ms | First Input Delay | | **CLS** | < 0.1 | Cumulative Layout Shift | | **API Response** | < 200ms | P95 response time | | **Database Query** | < 50ms | P95 query time | | **Memory Usage** | < 80% | Application memory threshold | ## Categories ### Fundamentals - Performance metrics and measurement - Bottleneck analysis techniques - Benchmarking methodologies ### Caching - Application caching strategies - Redis/Memcached implementation - HTTP caching headers - CDN configuration - Cache invalidation patterns ### Database Performance - Query optimization - Indexing strategies - Connection pooling - N+1 query prevention - Read replicas ### API Performance - Pagination strategies - Response compression - Batch operations - Async processing - Rate limiting ### Frontend Performance - Bundle optimization - Code splitting - Lazy loading - Image optimization - Core Web Vitals ### Profiling & Monitoring - CPU profiling - Memory analysis - APM tools - Performance testing ### Scaling - Horizontal vs vertical - Load balancing - Auto-scaling - Caching layers ## Performance Pyramid ``` ╱╲