I have seen other webmasters spread misinformation about this topic. It’s important to understand the intricacies of how evaluations are actually handled by Google.
It’s important because someone who thinks that Googlebot evaluates Core Web Vitals is likely to misdiagnose what’s causing their SEO issues.
We want to clear the air on this subject and make sure you have all the information you need to be well informed moving forward.
John Mueller Said…
While John Mueller has explicitly explained this in past webmaster hangouts, some still get it wrong.
Core Web Vitals are evaluated by field data. Googlebot is working to gather field data for when they have the Core Web Vitals page experience algorithm in place (most likely).
And yes, they don’t use the field data for anything quite yet.
What This Really Means
Basically, this means that Google will be using a separate set of data for Core Web Vitals.
They will not be using data from the algorithm to evaluate a site’s CWV.
Google explains that they use the following metrics and processes to evaluate them:
Google also explains some of the concepts behind what’s driving the Core Web Vitals metrics:
Core Web Vitals: Going Deeper
Barry Schwartz reported that:
Google’s Chrome User Experience Report has more information on this process.
It’s important to familiarize yourself with these processes because it will help you identify how to improve Core Web Vitals on your own site.
What We Need to Look For
As Google’s page experience update begins rolling out later this year, it will be important to see exactly how things work between the CrUX data, field data, lab data, and Core Web Vitals. The roles of these data will be useful for determining what you might want to change to improve your Core Web Vitals requirements.
While the impact of this update is expected to remain minimal, we still believe that all page speed optimizations necessitate a higher priority on your SEO task lists.