Core Web Vitals Visualizer

corewebvitals.io

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4.9 (

18 ratings

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Extension Developer Tools 10,000 users

1 support issue

For additional help, check out the developer's support site.

Barry Pollard

Dec 15, 2025

Be aware of an upcoming change to Chrome 145 which may impact this extension

Layout shifts are currently reported in physical pixels instead of CSS pixels. That is set to change in Chrome 145 which will mean screens of DPR > 1 will have different layout rects, which likely will require a change to this extension.

More details here: https://chromestatus.com/feature/5155103518228480
And on this email thread: https://groups.google.com/a/chromium.org/g/blink-dev/c/fMBXw2w6J7I/m/zl1pqtL5AAAJ