Google Core Web Vitals – What You Should Know

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Core Web Vitals are part of Google's Web Vitals initiative. The aim is to create a set of quality factors for the user experience (UX) on the web. These should be as simple as possible and understandable for all website operators. Google is thus taking further steps away from simple performance metrics and towards a measurable positive user experience.

What is behind "Core Web Vitals"?
The Core Web Vitals currently include three metrics that all websites should meet as well as possible: "loading time", "interactivity" and "visual stability". In English, these are called "Largest Contentful Paint (LCP)", "First Input Delay (FID)" and "Cumulative Layout Shift (CLS)" .

L argest
Contentful​
Paint​
“Largest Contentful Paint” or simply “LCP” is related to the well-known “ loading time ” of a website. In detail, this measures the time until the visually largest element in the user’s viewport has been rendered. In india mobile numbers list most cases, this is an image or video. Of course, on visually reduced pages, this element can also be a block of text, but there are usually hardly any speed problems here. Text can usually be loaded and displayed quickly and easily.

First​
I nput
delay​
In addition to a fast loading time , interactivity is also essential for a positive user experience : This is where "FID" or "First Input Delay" comes into play as a metric. The problem is familiar to all Internet users: the website does not respond to a click or an entry in a text field, or responds much later than expected. The time between the user's first interaction and the website's response is therefore too long. This time is precisely what is referred to as "First Input Delay".

C umulative
layout​
S hift
The biggest question mark currently concerns visual stability , which Google has given the cumbersome name "Cumulative Layout Shift" or "CLS". This measures the shifting of individual Document Object Model (DOM) elements, which are usually caused by asynchronous loading . It is important that only unexpected shifts are measured. If users actively click on a "read more" button, which causes parts of the website to shift, this follows an action and is therefore not added to the CLS value.