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Cumulative Layout Shift Issues
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Cumulative Layout Shift Issues
10-29-2020, 08:51 AM
Post: #1
Cumulative Layout Shift Issues
I have been trying to figure out CLS on a site and I have been using the Web Vitals Chrome extension based on's recommendation ( However, I can change the width of a test page and get wildly different results. Some widths will get a CLS score of zero. Other widths return a result over .4. As an example, below are some screenshots of the page showing different results based on width (which I found ironic).

So my question about's results is what width do they use for a site? Do they check multiple widths and average the score? How do we get a consistent score to know the site's true CLS? Better yet, how will Google judge on their search score?

Is there a reliable tool that can tell us what our site truly scores so we can accurately measure and fix sites accordingly? Help, please! Smile
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Cumulative Layout Shift Issues - doubled - 10-29-2020 08:51 AM

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