Largest Contentful Paint
Largest Contentful Paint (LCP) is one of the metrics tracked in the Performance section of the Lighthouse report. Each metric captures some aspect of page load speed.
Lighthouse displays LCP in seconds:
What LCP measures
LCP measures when the largest content element in the viewport is rendered to the screen. This approximates when the main content of the page is visible to users. See Largest Contentful Paint defined for more details on how LCP is determined.
How Lighthouse determines your LCP score
Browser support for LCP launched in Chrome 77. Lighthouse extracts LCP data from Chrome's tracing tool.
The table below shows how to interpret your LCP score:
| LCP time (in seconds) | Color-coding |
|---|---|
| 0-2.5 | Green (fast) |
| 2.5-4 | Orange (moderate) |
| Over 4 | Red (slow) |
See the Lighthouse performance scoring post to learn how your page's overall performance score is calculated.
How to improve your LCP score
See How to improve Largest Contentful Paint on your site.
Resources
- Source code for Largest Contentful Paint audit
- Largest Contentful Paint
- Largest Contentful Paint API
- New in Chrome 77: Largest Contentful Paint