Different statistics CRUX data between PSI and GCG

[Roman Kholiavko]

I can see different statistics CRUX between data from Page Speed Insights and Google Search Console.

On Page Speed Insights under "Origin Summary" I can see that my site passes CVW:
LCP 81% in green zone, 10% - yellow, 9% - red;
CLS 84% - green, 7% yellow, 9% - red.


But if I open Core Web Vitals report in Google Search Console  I see different situation:

regarding this graph my site has only 6,899 pages in green zone (that's 63.28% from 10901 pages in total), and it's mean that site does not pass CVW.


In details I can see that my site has:

1. LCP: 
    3,312 pages in yellow zone (that's 30,38%)
    583 pages in red zone (5,34% from total pages)
   
2. CLS:
   1,963 pages in yellow zone (18%)
    12 pages in red zone (0,11%)

Why percentage is different ? As I understand it's all coming from Crome UX report, so it must be the same, or I am mistaken ? 

[Ellery Womack]

Responding for visibility, this is an important issue.

[Vlad Calin Bilc]

Hey there Roman,

So as far as I understand from the documentation the data you see in the Chrome UX report is different from the data you see in Google Search Console in the sense that what you see in GSC is only the performance of your SEO pages, pages that are indexed by Google. Say you have an entire section of the website blocked from robots.txt, but you funnel users to this section of the website it's just that you don't want GoogleBot to see it, in this case, the following should happen:

1. The Web Core Vitals for this section will be aggregated and will influence the data in the Chrome User Experience Report
   
2. The  Web Core Vitals for this section will not show in Google Search Console
3. Depending on the difference in user experience on these non-indexable pages (be it slower or faster) you may see discrepancies between the two reports

Google Search Console

"The Core Web Vitals report shows URL performance grouped by status, metric type, and URL group (groups of similar web pages).

Only indexed URLs can appear in this report. The URLs shown are the actual URLs for which data was recorded (that is, data is not assigned only to a page's canonical URL, as it is in most other reports)."

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

Chrome User Experience Report

"Core Web Vitals are the subset of Web Vitals that apply to all web pages, should be measured by all site owners, and will be surfaced across all Google tools. Each of the Core Web Vitals represents a distinct facet of the user experience, is measurable in the field, and reflects the real-world experience of a critical user-centric outcome."

https://web.dev/vitals/#core-web-vitals

This is my interpretation of the two reports and based on the current documentation. I do have to make the disclaimer that I haven't seen this validated anywhere just yet.

Regards,

Vlad

[Rick Viscomi]

Hi Roman,

For a page or origin to pass the CWV assessment, it needs 75% of experiences to be better than the "good" thresholds. Your origin passing the assessment confirms that at least 75% of experiences on the site are good for each metric.

The distinction in Search Console is that it's reporting the number of pages rather than a percent of experiences, so the relative proportions aren't expected to be perfectly aligned. This is especially true for sites that have an uneven distribution of experiences across pages. For example, sometimes the most popular page has the worst performance, so most pages may pass but the origin overall may fail.

Hope that helps.

Rick