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Frontend speed directly impacts user experience and business outcomes. Google Core Web Vitals provide a standardized framework for measuring what matters. Largest Contentful Paint (LCP) measures loading performance and should be under 2.5 seconds. Interaction to Next Paint (INP) measures responsiveness and should be under 200 milliseconds. Cumulative Layout Shift (CLS) measures visual stability and should be below 0.1. This topic explains how to measure these metrics using Chrome DevTools, Lighthouse, and the web-vitals JavaScript library. We cover practical optimization techniques including image compression with modern formats like WebP and AVIF, code splitting, lazy loading, critical CSS extraction, and preloading key resources. You will learn how to set up Real User Monitoring to track actual visitor experiences rather than just lab results.
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