CLS et CRux !

[Claude BATAILLE]

 Why does the CLS of CRux vs. Lighthouse diverge?

[❄ Johannes Henkel]

CrUX publishes field data, which is collected from real users. So the CLS is not  an individual measurement but a statistical aggregation.

Lighthouse simulates a page visit, so it runs a localized test of a specific page load. This is also known as lab data. It's useful for diagnostics, e.g. sometimes it may give you an idea how to improve the CLS, but it doesn't always align with the statistical distribution from the field.

On Mon, Jun 1, 2026 at 1:47 PM Claude BATAILLE <bcomb...@gmail.com> wrote:

 Why does the CLS of CRux vs. Lighthouse diverge?

--
You received this message because you are subscribed to the Google Groups "Chrome UX Report (Discussions)" group.
To unsubscribe from this group and stop receiving emails from it, send an email to chrome-ux-repo...@chromium.org.
To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/chrome-ux-report/facb9bd5-d01f-4e35-bad9-8ece63a2872cn%40chromium.org.