Simulate and understand your Core Web Vitals scores — Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and First Input Delay (FID) — with optimization tips.
🚀 Launch Free Tool →✅ LCP, CLS, FID simulation
✅ Green / needs improvement / poor thresholds
✅ Optimization tip per metric
✅ Mobile vs desktop comparison
✅ Google ranking signal insights
Core Web Vitals are three real-world performance metrics Google uses as a ranking factor: LCP (load time of largest element), CLS (visual stability), and FID/INP (interactivity).
LCP under 2.5 seconds is 'Good', 2.5–4.0 seconds 'Needs Improvement', and over 4.0 seconds 'Poor'. Aim for under 2.5s for good SEO.
Set explicit width/height on images and videos, avoid inserting content above existing content, and use CSS transform animations instead of layout-affecting properties.