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Largest Contentful Paint (LCP)
The short answer
LCP measures how long it takes for the largest, main piece of content on a page — usually a hero image or headline — to fully load and appear on screen.
Full explanation
Google considers an LCP under 2.5 seconds good. Common fixes include compressing hero images, removing render-blocking scripts, and using a content delivery network so the file has less distance to travel to the visitor.
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