Google's John Mueller answers why core web vitals scores seem to always change even when web pages remain the same
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John Mueller answered a question in the SEO Office-hours session about why the core web vitals scores keep changing even though the web pages themselves have not changed.
There are two kinds of core web vitals scores:
- Field Data
These are the core web vitals scores that are recorded from actual visitors visiting a website in the real world.
The purpose of Field Data is to show the real-world user experience of actual site visitors to a given site. - Lab Data
These are core web vitals scores that are generated by a simulated visit. A bot from Google Lighthouse that is using a user agent identified as Chrome/94.0.4590.2 will visit the page that is being tested and an algorithm will simulate that the visit was on a mobile phone and on a throttled internet connection. The page loading information is collected and an artificial core web vitals score generated.The purpose of Lab Data is diagnostic. Lab Data helps a site publisher or an SEO troubleshoot web page performance. Lab Data provides information that will help a publisher or an SEO understand what is slowing down the web page and provide hints for fixing the problems.
Screenshot of John Mueller Discussing Core Web Vitals Scores
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