Page Speed Estimator
Estimate your website's loading speed based on technology stack, assets, and hosting. Get a Lighthouse-style performance score with specific optimization tips.
Analytics, chat widgets, ad scripts, social embeds
Understanding Core Web Vitals
Largest Contentful Paint (LCP)
Measures loading performance. LCP should occur within 2.5 seconds of when the page first starts loading. It tracks when the largest image or text block becomes visible in the viewport.
First Contentful Paint (FCP)
Measures the time from navigation to when the browser renders the first piece of DOM content. A fast FCP (under 1.8s) reassures users that something is happening and the page is loading.
Total Blocking Time (TBT)
Measures the total time between FCP and Time to Interactive where the main thread was blocked long enough to prevent input responsiveness. Keep TBT under 200ms for a responsive experience.
Cumulative Layout Shift (CLS)
Measures visual stability. CLS should be kept under 0.1. It quantifies how much visible content shifts unexpectedly during the page's lifetime, caused by images without dimensions, late-loading fonts, or dynamic content.
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