LCP

What is LCP?

LCP, or Largest Contentful Paint, is a Core Web Vital metric that measures how long it takes for the largest visible content element on a webpage to fully render within the user's viewport after the page begins loading.

The "largest contentful element" is typically the hero image, a large headline, or a video thumbnail — whatever takes up the most visual space in the initial view.

LCP Thresholds and Causes

Google's LCP thresholds: Good (under 2.5 seconds), Needs improvement (2.5 to 4.0 seconds), and Poor (over 4.0 seconds).

Common causes of poor LCP include: large, unoptimized images (the most common culprit — high-resolution images without proper compression or modern format like WebP or AVIF), slow server response time, render-blocking JavaScript or CSS (scripts and stylesheets that delay the browser from rendering the page), and no preloading of critical resources.

How to Improve LCP on Webflow

How to improve LCP on Webflow: use WebP format for all images (especially hero images), set explicit width and height on images to prevent layout shifts (also helping CLS), preload the hero image in the page's custom code head, minimize heavy third-party scripts that load before the main content, and use Webflow's built-in CDN via Webflow Hosting.

At Appsrow, LCP optimization is part of our standard pre-launch checklist.