Largest Contentful Paint (LCP) measures how quickly the biggest visible content on a webpage loads, like an image or a big block of text. A good LCP score is 2.5 seconds or less (anything slower can make users bounce away in frustration). To improve your LCP, try optimising images, using browser caching, and reducing server response times. Better LCP not only boosts your SEO but also makes for a smoother experience for visitors.