Core Web Vitals.
Core Web Vitals are a newer element in the world of Google but have quickly become one of the most important in terms of SEO.
Core Web Vitals are a set of factors that Google considers important for the user experience of a website, and therefore uses these as a ranking factor for Google's "page experience" score. They measure and assess the speed, responsiveness and visual stability of a website.
If done correctly, Core Vitals offer more opportunities for a high ranking, but if they are not implemented correctly, they can be detrimental to your rankings.
What Are Core Web Vitals?
Core Web Vitals consist of three specific measurements, looking at page speed and user interactions. The three measurements are; largest contentful paint, first input delay, and cumulative layout shift.
LCP: Largest Contentful Paint
Largest Content Paint measures the loading performance of a website from the point of view of a user. More simply, how long does it take for the majority of content to load on the page?
For a good user experience, Google states that LCP loading time should occur within a maximum of 2.5 seconds of when the pages on your site first start to load.
FID: First Input Delay
First Input Delay measures the interactivity of a webpage. How easy is it for users to interact with your website? Examples of user interaction are choosing a menu option, entering an email or clicking on a link etc.
FID measures the time it takes for a user to complete an action on your page. For the best user experience, Google states that any webpage should have an FID of 100 milliseconds or less.
CLS: Cumulative Layout Shift
Cumulative Layout Shift measures the visual stability of a website. This means if the page elements move around the screen while the page loads, your CLS will be high.
Google prefers page elements to be stable in the loading process so that users are aware of where the links, images and forms are located. For peak user experience, Google states that any webpage should have a CLS of 0.1. or less.