Web Vitals

Web Vitals is a Google initiative aimed at helping developers measure and improve user experience on the web. It focuses on a set of core performance metrics that capture real-world aspects of how users perceive a page’s speed, responsiveness, and visual stability.

The Core Web Vitals include:

  • Largest Contentful Paint (LCP): Measures loading performance. It should occur within 2.5 seconds of the page loading.

  • First Input Delay (FID): Measures interactivity. Should be less than 100 milliseconds.

  • Cumulative Layout Shift (CLS): Measures visual stability. Pages should have a CLS of less than 0.1.


These metrics are part of Google's page experience ranking signal, meaning better Web Vitals can positively impact SEO.


Tools to measure Web Vitals:

  • PageSpeed Insights

  • Chrome DevTools

  • Lighthouse

  • Web Vitals library (for real-user monitoring)


Why they matter:

Improving these metrics leads to faster, smoother, and more user-friendly websites—especially on mobile devices or slower connections. Optimizing Web Vitals can result in better engagement, lower bounce rates, and improved search rankings.


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