PageSpeed Insights

A score of 90 or above is considered good, while 50 to 89 needs improvement, and below 50 is considered poor. Google uses these Core Web Vitals metrics as a ranking factor, especially for mobile searches. Maintaining a high score ensures your website provides a fast, user-friendly experience that search algorithms reward.

Field Data shows actual loading experiences collected via the Chrome User Experience Report over the last 28 days. Lab Data is simulated in a controlled environment using Lighthouse to provide immediate diagnostic performance metrics. Field data reflects what real users are actually experiencing, while lab data helps developers pinpoint specific code bottlenecks.

Yes, the tool provides separate performance reports for both mobile and desktop devices. The mobile analysis typically includes stricter throttling for CPU and network conditions to simulate real-world cellular environments. This distinction is crucial because mobile devices generally have less processing power and less reliable internet connections than desktop computers.

Core Web Vitals consist of three specific metrics: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). These measurements quantify the actual loading speed, interactivity, and visual stability of your website. Google specifically uses these three metrics to evaluate the overall user experience of a page.