Largest Contentful Paint (LCP) measures the time it takes for the largest visible content element on a page — usually a hero image or heading — to fully render. Google considers an LCP under 2.5 seconds "good," a threshold you can test directly with Google PageSpeed Insights (opens in new tab).
Why This Specific Element Gets Measured
The largest visible element is usually what a visitor is actually waiting for before a page feels "loaded," even if smaller elements around it have already appeared. A page that shows a header and footer instantly but leaves a big blank space where the hero image should be still feels slow, which is exactly the experience LCP is designed to capture.
Compressing images, serving them in modern formats like WebP, and making sure the hosting server responds quickly to the first request are usually the highest-impact fixes, since the largest element is often also the heaviest one to download.
Google’s free PageSpeed Insights tool reports LCP directly, along with specific suggested fixes for the page tested, making it a practical starting point for diagnosing a slow-loading page.
People also ask
What usually causes slow LCP?
Unoptimized large images, slow server response time, and render-blocking scripts loaded before the main content are the most common causes of poor LCP scores.
See also
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