Cumulative Layout Shift over 0.25

Warning severity, in the performance tab

Why it matters

Content jumps around while the page loads. Google's threshold for a good CLS is 0.1; above 0.25 the page fails the Core Web Vitals assessment.

How to fix it

Give images, ads and embeds explicit width and height, reserve space for late content, and avoid inserting elements above existing ones.

How Crawlune finds it

Crawlune flags Cumulative Layout Shift over 0.25 automatically on every crawl and lists the affected URLs under the performance tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 550 URLs with every check enabled.