Over the last few years, Google has been quite busy adding speed metrics which they have stated will influence the search engine ranking of websites. Just to name a few factors that contribute to the SEO of websites:

  • Speed of website
  • Whether it has https or not (SSL certificate)
  • Mobile optimized with mobile indexing

To continue to improve the experience web users have with websites, Google has introduced three new metrics for determines the page experience one can have on a website – these are branded under the name ‘Core Web Vitals’.


What are the Core Web Vitals

The Core Web Vitals are three extra factors that can influence the page experience a web user has on a website. This includes:

  • Largest Contentful Paint (LCP) – this measures loading performance: how long does it take for the largest contentful paint to be loaded. Google states under 2.5 seconds are good, whilst 4+ seconds as poor.
  • First Input Delay (FID) – this measures interactivity: how quickly is the web page able to become interact upon being requested to load. Under 100 milliseconds is deemed good, whilst over 300 milliseconds is poor.
  • Cumulative Layout Shift (CLS) – this measures the web page stability: how the content moves with different parts of loading, or how responsive and stable the site is. If it is under 100 milliseconds, this is good, whilst over 250 milliseconds is poor.

In the words of Google:

The page experience signal measures aspects of how users perceive the experience of…

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