Test your Core Web Vitals and page performance. Check LCP, CLS, FCP, TTFB, and get insights to improve your website speed.
Test may take 10-30 seconds to complete
Comprehensive performance analysis
Measure LCP, CLS, and FCP - the key metrics Google uses for page experience ranking.
Get detailed timing metrics including TTFB, DOM interactive, and full load time.
See total page weight broken down by JavaScript, CSS, and images.
Get an overall performance score with grade and actionable recommendations.
Core Web Vitals are a set of metrics that measure real-world user experience: LCP (Largest Contentful Paint) measures loading, CLS (Cumulative Layout Shift) measures visual stability, and FID/INP measures interactivity.
LCP should be 2.5 seconds or less for a good user experience. Between 2.5-4 seconds needs improvement, and over 4 seconds is considered poor.
CLS (Cumulative Layout Shift) measures how much page content shifts during loading. A good score is 0.1 or less. High CLS causes frustrating user experiences when buttons or text move unexpectedly.
TTFB (Time to First Byte) measures how long it takes for the browser to receive the first byte of response from the server. A good TTFB is under 800ms.
Google uses Core Web Vitals as a ranking factor. Pages with good Web Vitals may rank higher than similar pages with poor performance, especially for competitive searches.
Get detailed fixes, historical tracking, and alerts when performance degrades with SIGMAEO Pro.