High CLS on CrUX and Search Console but Zero CLS in Lighthouse and Performance Panel

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Eden Xiao

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Jun 5, 2025, 9:54:16 AM (4 days ago) Jun 5
to Chrome UX Report (Discussions)

Hi everyone,

We’ve noticed a discrepancy between the CLS (Cumulative Layout Shift) values reported in different tools. On both cruxvis.withgoogle.com and Google Search Console, our CLS scores are consistently high — often above 0.4. However, when we test the same page locally using Lighthouse or Chrome DevTools Performance panel (F12), the CLS shows as 0, and visually we don't observe any layout shifts.

The user experience seems stable, and we are unable to reproduce the issue manually or through simulated testing.

How can we quickly reproduce or simulate the same layout shifts that real users might be experiencing?

We’re looking for guidance on identifying what might be causing this discrepancy and how to debug it effectively.

Thanks in advance for your help!

Barry Pollard

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Jun 5, 2025, 10:08:03 AM (4 days ago) Jun 5
to Eden Xiao, Chrome UX Report (Discussions)
There’s advice in this article


In short, Lighthouse only does a load of the page, but CLS can show as your scroll and interact with the page which Lighthouse does not do.

Also make sure you understand whether you are seeing URL-level CrUX data or if it’s falling back to group-level (Google Search Console) or origin-level (PSI and CrUX Vis) data — which may indicate the issue is not on this page but in other pages on the site.


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