Core Web Vitals Weighting

[Omazza T]

Hello Google

Do we have any guidance on what the weighting will be for each of the 3 Core Web Vitals.

Lighthouse has weightings applied in the Lab https://googlechrome.github.io/lighthouse/scorecalc/

Any thoughts on whether the lighthouse weightings are a good enough indicator for how weightings will apply in the CRUX report?

Thanks,

Omari

[Omari Whyne]

Hi there,

Can anyone provide insight please?

Thanks

Omari

[Peter Nikolow]

There isn't weighting...

Everything important is table here:
https://support.google.com/webmasters/answer/9205520?hl=en
"Status definitions".

So if you have page "Good" on FID & LCP, but poor on CLS - page will be marked as poor.

If you have page "Need improvemens" on CLS and FID, but marked poor on LCP then will be marked as poor.

Even Google wrote that on same page:
"Status: Poor, Need improvement, Good

The labels Poor, Needs improvement, and Good are applied to a URL on specific device type.

URL status

A URL's status is the slowest status assigned to it for that device type. So:

A URL on mobile with Poor FID but Needs improvement LCP is labeled Poor on mobile.

A URL on mobile with Needs improvement LCP but Good FID is labeled Needs improvement on mobile.

A URL on mobile with Good FID and CLS but no LCP data is considered Good on mobile.

A URL with Good FID, LCP, and CLS on mobile and Needs improvement FID, LCP, and CLS on desktop is Good on mobile and Needs improvement on desktop."

Technically page will be marked with weakest metric label on test where it fails to be good.

Regards,

Peter

[Omari Whyne]

Thank you Peter, this is an excellent explanation!