LCP (Largest Contentful Paint)
Definition
LCP is a Core Web Vitals metric that measures how long it takes for the largest visible element (image, heading, or text block) to render on screen.
Plain English
It answers "when does the main content actually appear?" Good LCP is under 2.5 seconds.
Why it matters
- Slow LCP means users see a blank or incomplete page for too long.
- It's the primary "perceived speed" metric in Core Web Vitals.
- Common fixes: optimize images, preload fonts, reduce server response time.