Google’s Core Web Vitals (CWV) aim to measure website quality and user experience.
To do that, several new metrics were developed which can be collected in the Chrome browser.
Three of these metrics form the Core Web Vitals:
- Largest Contentful Paint.
- Interaction to Next Paint.
- Cumulative Layout Shift.
Largest Contentful Paint
The Largest Contentful Paint (LCP) metric measures how quickly the single biggest piece of page content appears on the page after a visitor opens a page.
You can see an example of the LCP in this DebugBear rendering page speed filmstrip, which shows what content would be visible to users at different points in time.