How can I find out which pages on my website have high CLS?

Question

When testing various pages from my website on pagespeed.web.dev I get real CLS under 0.1 for most of them but I still have core web vitals failed for desktop because it seems that I have like under 30% of pages with CLS higher than 0.1.

The thing is that I have yet to find a page that has over 0.1, I need to know how can I find those pages so I know what to fix.

Answer 1

Google has a suggested workflow for optimizing Core Web Vitals. In your case, you know your site has a CLS issue, but you're not sure where. The recommended tools to identify which pages need improvement are:

1. Use PageSpeed Insights to view overall Core Web Vitals experience metrics on the origin, and specific information on an individual URL. (you've done this)
2. Search Console can be useful to identify pages which need improvement where its page grouping feature works well for your site.
3. If you have RUM data, then that is often the best option to be able to identify particular pages or traffic segments with issues.

So your next step should be to check Search Console, which will identify groups of similar pages with CLS issues. Or, even better, measure your Core Web Vitals yourself.