1.5 Performance & Core Web VitalsMediumVerified
CLS > 0.1
Cumulative Layout Shift measures how much the page jumps around as it loads. Above 0.1 the experience feels unstable, and the usual culprits are images and ads without reserved space.
What it is
Cumulative Layout Shift above ‘good’.
Why it matters
Visual instability harms UX; part of page experience.
How to fix it
Reserve space for media/ads; set dimensions.
How to find it on your site
- Read CLS in PageSpeed Insights field data and the Search Console Core Web Vitals report.
- Watch the page load and note anything that shifts: images, ads, banners, late-loading fonts.
- Set explicit width and height, or aspect-ratio, on media so space is reserved.
- Reserve space for any dynamically injected element.
Cross-reference to ranking and citation factors
CLS is a Core Web Vital and a direct user-experience signal. A jumpy layout also causes misclicks, which hurts engagement.
Impact
Low-medium. Direct.
Evidence
CLS ‘good’ < 0.1. web.dev, Core Web Vitals (Google); Google Search Central, Understanding page experience in Google Search results
Sources