Core Web Vitals Checker
Test and diagnose your website performance. Understand exactly how metrics like LCP, INP, and CLS affect your user experience.
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What are Core Web Vitals?
Core Web Vitals are a set of specific factors that Google considers important in a webpage's overall user experience. They focus on three main aspects of the user experience: loading speed, interactivity, and visual stability.
Understanding LCP (Largest Contentful Paint)
Largest Contentful Paint (LCP) measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading. This metric reports the render time of the largest image or text block visible within the viewport.
Understanding INP (Interaction to Next Paint)
Interaction to Next Paint (INP) observes the latency of all interactions a user has with the page, and reports a single value which all (or nearly all) interactions were below. A low INP means the page was consistently able to respond quickly to all—or the vast majority—of user interactions. An INP at or below 200 milliseconds means your page has good responsiveness.
Understanding CLS (Cumulative Layout Shift)
Cumulative Layout Shift (CLS) measures visual stability. It helps quantify how often users experience unexpected layout shifts—a low CLS helps ensure that the page is delightful. To provide a good user experience, pages should maintain a CLS of 0.1. or less.
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