Core Web Vitals are a set of specific, measurable metrics introduced by Google that quantify the real-world user experience of loading, interactivity, and visual stability of a web page. They are a critical component of Google's page experience signals, which influence search rankings. The three current Core Web Vitals are Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Interaction to Next Paint (INP).
For developers, optimizing Core Web Vitals is paramount for both user satisfaction and SEO. Poor scores can lead to a degraded user experience, higher bounce rates, and potentially lower search rankings. Google provides tools like PageSpeed Insights and Lighthouse to help you diagnose and improve these metrics.
For example, if your website has a high CLS score, it means users are experiencing unexpected layout shifts, which can be frustrating. Addressing this by ensuring images have explicit dimensions or pre-allocating space for dynamic content will improve the user experience and your Core Web Vitals score, positively impacting your site's SEO performance.