Core Web Vitals Test
Check the key performance metrics of your website: LCP, CLS, INP and TTFB. Find out what affects your Google ranking.
What are Core Web Vitals?
Core Web Vitals are key metrics that Google uses to evaluate user experience on your website.
LCP - Largest Contentful Paint
Measures the time it takes for the largest visible element to load. Affects how quickly users see the main content.
CLS - Cumulative Layout Shift
Measures visual stability. Detects unexpected layout shifts that annoy users and cause accidental clicks.
INP - Interaction to Next Paint
Measures page responsiveness to user interactions. Evaluates how quickly the page reacts to clicks, taps and keyboard input.
TTFB - Time to First Byte
Measures server response time. The time from sending a request to receiving the first byte of response.
Frequently Asked Questions
Core Web Vitals are three metrics Google uses to measure real user experience: LCP (how fast the main content loads), INP (how quickly the page reacts to clicks) and CLS (how much the layout jumps around while loading).
The Google thresholds for a good result are: LCP up to 2.5 seconds, INP up to 200 milliseconds and CLS up to 0.1. To pass the assessment, at least 75% of your page loads should stay within these limits.
Yes — Core Web Vitals are part of the Google page experience signals and can decide the order of pages with similarly relevant content. In practice a fast page also converts better and has a lower bounce rate.
Start with the biggest wins: compress and convert images to WebP, enable caching and a CDN, lazy-load images below the fold and cut unused JavaScript and CSS. Run the test above to see which of these issues affect your site.
Want a comprehensive SEO analysis?
Core Web Vitals are just the beginning. Check all SEO aspects of your website.
Run Full SEO AnalysisOther free SEO tools
Check other tools for analyzing your website