Core Web Vitals Metrics

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“For example, blocking a large image can cause a page to be considered mobile-optimized when it is not. Blocking a CSS file can result in incorrect font styles being used, which may be too small for some devices” (Search Console Help: Mobile Usability Test ).

Loading Speed: Core Web Vitals Metrics
In June 2021, Google will introduce a new ranking signal ( Page Experience ) that will include Core Web Vitals metrics . These metrics are related to page speed: how quickly it loads, how soon togo email list it becomes interactive, and how consistently it behaves while loading .

Figure 6 Core Web Vitals metrics; image source ; modified.

LCP = Largest Contentful Paint . The "Largest Contentful Paint" metric indicates how long it took to render the largest content element visible in the viewport from the time the user requested the URL.
FID = First Input Delay. The "first input delay" is the time from the first user interaction with the page (e.g. clicking a link, tapping a button, etc.) until the browser responds to that interaction. This is important for pages where the user must perform some action.
CLS = Cumulatice Layout Shift. Cumulatice Layout Shift is a measure of how much the layout of a page changes during load. The score ranges from 0-1. Zero means no changes and 1 means the most changes. This is important because if elements on a page move around when a user tries to use them, it doesn’t look good ( Search Console Help : “ Core Web Vitals Overview ”).