What are Core Web Vitals?

[mouakter13]

They can be used to determine specific bottlenecks, such as server load, CMS cache , browser cache, download speed, and JavaScript efficiency . But they cannot determine whether a page provides a good or bad user experience. For example:

An app may download and appear quickly but become unresponsive after the first interaction because it is running a lot of unoptimized JavaScript code.
A chat application might continuously download data as users post messages. A testing tool might assume that it has not finished loading, even though the page appears to be responsive.
Core Web Vitals is Google’s goal to solve these dilemmas.

Google's Core Web Vitals (CWV) are three performance metrics that evaluate real-world user experience:

Largest Contentful Paint -LCP (largest visible content spain whatsapp number data element render time): Loading performance
First Input Delay- FID : Interactivity performance
Cumulative Layout Shift (CLS): Visual stability performance
This new Google algorithm update has started rolling out globally at the end of August 2021. Core Web Vitals metrics primarily affect mobile search results, but desktop equivalents will follow if the experiment is successful.

A page's LCP, FID, and CLS scores are based on the last 28 days of real user metrics collected anonymously through the Chrome browser. These measurements can vary due to the user's device, connection, and other concurrent activity, so the 75th percentile is calculated rather than an average.

In other words, all user metrics are ranked from best to worst, and the figure at the three-quarters point is taken. Therefore, three out of four website visitors will experience that level of performance or better.

Any page that scores well (green) on all three Core Web Vitals metrics will receive higher rankings in search results and will be included in the Google News app’s “Top Stories” carousel.

In the following sections, we'll describe the algorithm used to calculate a metric, the tools you can use to identify a page's score, typical causes of low scores, and steps you can take to resolve performance issues.