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Diagnose and fix the three Core Web Vitals metrics that impact search ranking and user experience. \n \n Covers LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift) with specific thresholds and optimization strategies for each \n Includes common causes, code examples, and debugging scripts for identifying bottlenecks in loading, interactivity, and visual stability \n Provides framework-specific quick fixes for Next.js, React, and Vue/Nuxt, plus measu