The Largest Contentful Paint (LCP) metric reports the relative time it takes for the largest image or block of text visible in the viewport to finish rendering, based on the point in time when the page first starts loading.
First Contentful Paint (FCP) is an important user-centric metric for measuring perceived load speed because it marks the point in the page load timeline when the user first sees anything on the screen. A fast FCP helps reassure users that something is going on.
What is CLS? To provide a good user experience, sites should strive to keep CLS scores at or below 0.1. To ensure you are hitting the recommended target for the majority of your users’ visits, a good measurement threshold is the 75th percentile of page loads, which applies to both mobile and desktop devices.
