LCP stands for Largest Contentful Paint. In plain language: it is the time it takes for the largest visible part of your page to appear on screen. Usually that is a big photo at the top, a main video or a large heading.
Google measures this because it is a good predictor of how quickly visitors "feel at home" on your site. If the main content only appears after 8 seconds, many people have already left.
What are good LCP values?
- Under 2.5 seconds: good. Visitors experience your site as fast.
- 2.5 to 4 seconds: too slow. Noticeable waiting.
- Over 4 seconds: poor. People drop off and Google lowers your rankings.
Why is your LCP sometimes so high?
The most common causes:
- Your hero image (the big photo at the top) has a huge file size (5 MB instead of 200 KB)
- The image only loads after all the other scripts, instead of right at the start
- Your server is slow to respond
- Too much JavaScript on the page that blocks loading
What can your web developer do?
Concrete actions, in order of impact:
- Compress your hero image (from MB to KB, with no visible loss in quality)
- Use modern image formats such as WebP
- Add 'preload' to the most important image so the browser fetches it right away
- Choose a faster hosting provider if you are currently on budget hosting
What difference does it make in Google?
A big one, directly. LCP is one of the three 'Core Web Vitals' that Google measures as a ranking factor. Sites that go from 5 seconds to 2 seconds often see a noticeable ranking improvement within 6 weeks, provided the rest of their SEO is also in order.