#core-web-vitals

Systematically improve product performance and user experience. Performance metrics: 1. Core Web Vitals: Largest Contentful Paint (LCP <2.5s), First Input Delay (FID <100ms), Cumulative Layout Shift (CLS <0.1). 2. Time to First Byte (TTFB <600ms). 3. Time to Interactive (TTI <5s). 4. Application response times: API calls, database queries. Performance monitoring: 1. Real User Monitoring (RUM): actual user experience data. 2. Synthetic monitoring: automated performance tests. 3. Server monitoring: CPU, memory, disk usage. 4. CDN analytics: cache hit rates, edge performance. Optimization strategies: 1. Frontend: code splitting, lazy loading, image optimization, caching. 2. Backend: database query optimization, caching layers, microservices. 3. Infrastructure: CDN, load balancing, auto-scaling. Tools: Google PageSpeed Insights, New Relic, DataDog for monitoring. Performance budget: set thresholds, alert when exceeded, gate deployments on performance regression.