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Core Web Vitals
Definition
Google's set of three specific performance metrics that measure real-world user experience on a webpage: LCP (loading), FID (interactivity), and CLS (visual stability).
Why it matters
Core Web Vitals directly affect your Google search ranking. A slow or visually unstable page scores poorly, appearing lower in search results than competitors with better scores.
Example
Your LCP (Largest Contentful Paint) is 4.8s, Google considers anything above 2.5s "poor." Compressing your hero image from 2MB to 200KB drops LCP to 1.8s. Your Google ranking improves.
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