Core Web Vitals are user-focused metrics that Google uses to measure the overall user experience of web pages. These metrics are designed to help site owners and developers identify areas where they can improve websites, particularly in relation to page speed, responsiveness, and visual stability. Core Web Vitals are important because they directly impact site performance, user experience as well as SEO rankings – all of which, if optimized, will drive traffic, engagement, and conversion rates.
This measures how long it takes for the largest piece of content on a web page (usually an image or video) to load and become visible to the user. Google recommends that LCP should be less than 2.5 seconds for a good user experience.
This measures how much a web page's visual layout shifts or jumps around during the loading process. A low CLS score means that the visual layout of the page remains stable during loading. A good CLS score is less than 0.1.
Google's newest metric assesses a web page's overall responsiveness to user interactions by measuring the latency of all interactions throughout the page's lifecycle. Unlike the now-retired FID metric (First Input Delay) which only measures the first interaction, INP captures a more complete picture of the site's responsiveness. A good INP score is less than 200 milliseconds.
While Core Web Vitals and Page Speed Metrics both measure website performance, they focus on different aspects of the user experience.
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