I have a site that has "99.9% URLs with a good page experience" (on mobile) and no issues with core web vitals, mobile usability, security, or HTTPS (all URLs pass on all fronts). This has been the state of the site for over two months now.

My understanding is that this should imply that (almost) all mobile search impressions for the site should be marked as having a "good page experience", so "good page experience" mobile search impressions should be (close to) 100% of mobile search impressions, and "good page experience" mobile search clicks should be (close to) 100% of mobile search clicks.

However, "good page experience" mobile search impressions are a little under 50% of mobile search impressions, with the percentage staying around 50% each day. "Good page experience" mobile search clicks are a little under 90% of mobile search clicks (this pattern holds for data restricted to a recent week, well after everything turned green in search console). I'm accessing "good page experience" by using the Search Appearance drilldown available in Google Search Console.

I tried digging into this by downloading CSVs for impressions broken down by page, and then diffing the CSV for overall mobile search impressions with the CSV for "good page experience" mobile search impressions. I found that in many cases, a single page has some "good page experience" mobile search impressions, but not all the mobile search impressions for that page have good page experience. Since the pages in question have had "good page experience" for the whole duration, I would expect to see all their mobile search impressions as having good page experience.



Core Web Vitals are not always available for all the URLs.

Ref: https://support.google.com/webmasters/answer/9205520?hl=en

The report is based on three metrics: LCP, FID, and CLS. If a URL does not have a minimum amount of reporting data for any of these metrics, it is omitted from the report.

"Page experience on mobile" report is based on the URLs for which the core web vital metrics have been measured (field data) by Google. Also, it seems only those URLs with field data show up on the "Good Page Experience" drill down in the "Performance" report.

Note: In my case, I compared the total impressions of Good URLs on the Page Experience report and the total impressions from Good Page Experience drill down. The numbers are very close.

  • All the information you posted seems correct, but I don't immediately see how it explains all my observations, specifically about urls for which some but not all mobile search impressions are marked as having good page experience. – Vipul Naik Jun 21 at 4:18
  • The only explanation I can think of is this - Google isn't collecting and/or attributing page experience to the impressions that are left out. Also, that doesn't seem to mean that the left-out impressions had a poor experience. – Kannan Jun 21 at 4:57

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