High-performing web apps hinge on seamless UX. This article explains why performance monitoring matters, outlines Core Web Vitals (LCP, FID, CLS) and user-centric metrics (TTI, Speed Index, User Timing), and highlights tools (PageSpeed Insights, WebPageTest, Lighthouse) and best practices (image optimization, caching, code splitting, CDNs), with an e-commerce case study showing faster loads and higher conversions.
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