Identify and fix performance issues to create faster, smoother user experiences. Assess Performance Issues Understand current performance and identify problems: 1. Measure current state : - Core Web Vitals : LCP, FID/INP, CLS scores - Load time : Time to interactive, first contentful paint - Bundle size : JavaScript, CSS, image sizes - Runtime performance : Frame rate, memory usage, CPU usage - Network : Request count, payload sizes, waterfall 2. Identify bottlenecks : - What's slow? (Initial load? Interactions? Animations?) - What's causing it? (Large images? Expensive JavaScript? Layout thr…