What are Core Web Vitals and why do they matter for SEO?

Core Web Vitals are three specific metrics Google uses: LCP (Largest Contentful Paint) measures loading performance, FID (First Input Delay) measures interactivity, and CLS (Cumulative Layout Shift) measures visual stability. They matter for SEO because Google uses them as ranking factors—sites with good Core Web Vitals rank higher. They also directly impact user experience—slow, unresponsive sites frustrate users. Good Core Web Vitals correlate with better conversions and lower bounce rates. Google provides tools to measure Core Web Vitals and offers guidance on improvements. Many performance consultants focus heavily on Core Web Vitals as they affect both SEO and user experience.