Conversion & UX
LCP (Largest Contentful Paint)
Quick definition
A Core Web Vital measuring how long the largest above-the-fold element takes to render. Google's target: under 2.5 seconds.
What it actually means
LCP measures perceived loading speed: how fast the main image, headline, or hero block becomes visible. Common eCommerce culprits for slow LCP: unoptimized hero images, use WebP, srcset, and preload, render-blocking third-party scripts such as review widgets and popup apps, heavy theme JavaScript, and slow Shopify metafield queries. Google rates LCP under 2.5 seconds as Good.