Understand the Core Web Vitals metrics that Google uses to rank your website. Learn what LCP (Largest Contentful Paint), CLS (Cumulative Layout Shift), and FCP (First Contentful Paint) mean and how to optimize them.
Start Measuring NowCore Web Vitals are a set of specific metrics that Google considers important for user experience on the web. They directly impact your search engine rankings. Google uses these metrics to understand how users actually experience your website.
There are three Core Web Vitals that you need to optimize:
Important: As of 2021, Core Web Vitals are a ranking factor in Google Search. Websites with better scores have an advantage in search results, especially on mobile.
Loading Performance
LCP measures how long it takes for the largest content element (image, video, or text block) to become visible in the viewport. It tells you when your page's main content has loaded.
Visual Stability
CLS measures visual stability by quantifying how much content shifts unexpectedly during page load. Ever clicked a button only to have it move and click something else? That's a layout shift.
Perceived Load Speed
FCP measures the time from when the page starts loading to when any part of the page's content is rendered on the screen. It's the first signal to users that your page is loading.
Google uses Core Web Vitals as a ranking signal. Better scores mean better visibility in search results, especially on mobile devices.
Fast, stable pages keep users engaged. Studies show that even 100ms improvements in load time can increase conversions.
Better Core Web Vitals correlate with higher conversion rates. Amazon found that every 100ms of latency cost them 1% in sales.
Mobile users are especially sensitive to performance issues. Good Core Web Vitals ensure a smooth experience on all devices.
We measure all Core Web Vitals across 18 global regions using Google Lighthouse. Every audit runs 3 times and reports the median for reliable results.
Track LCP, CLS, FCP, and all other Lighthouse metrics. See exactly where you stand and what needs improvement.
Test from 18 regions worldwide. Know how your Core Web Vitals perform for users in different locations.
Monitor changes over time. See if your optimizations are working and catch regressions early.
Get notified when your Core Web Vitals drop below thresholds. Fix issues before they impact rankings.