Google ‘Web Vitals’ checks sites’ UX and performance

Chromium Blog: Introducing Web Vitals: essential metrics for a ...
Google has now announced the Web Vitals initiative which aims to provide “unified guidance for quality signals that are essential to delivering a great user experience on the web”. 
• Core Web Vitals are a subset of all the Web Vitals that apply to all web pages, should be measured by all website owners, and will be surfaced across all Google tools. Currently, these Core Web Vitals focus on three aspects of the user experience — loading, interactivity, and visual stability — and include the following metrics: 
• Largest Contentful Paint (LCP): measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading. 
• First Input Delay (FID): measures interactivity. To provide a good user experience, pages should have a FID of less than 100 milliseconds.


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