Let’s have a basic understanding of First Contentful Paint (FCP), First Input Delay (FID), Largest Contentful Paint (LCP), and Cumulative Layout Shift (CLS). While checking Google PageSpeed Insights or any other web page speed testing tool, we may find such terms. Here let’s get a basic understanding of these terms.
First Contentful Paint (FCP)
First Contentful Paint (FCP) is an important, user-centric metric for measuring perceived load speed because it marks the first point in the page load timeline where the user can see anything on the screen—a fast FCP helps reassure the user that something is happening.
First Input Delay (FID)
Largest Contentful Paint (LCP)
Largest Contentful Paint (LCP) is a Core Web Vitals metric and measures when the largest content element in the viewport becomes visible. It can be used to determine when the main content of the page has finished rendering on the screen. The most common causes of poor LCP are Slow server response times.
Cumulative Layout Shift (CLS)
Cumulative Layout Shift (CLS) is an important, user-centric metric for measuring visual stability because it helps quantify how often users experience unexpected layout shifts—a low CLS helps ensure that the page is delightful.
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