How to Fix Cumulative Layout Shift (CLS)
Your page shifts as it loads, creating a janky, low-quality experience.
Symptoms you'll see
CLS measures visual stability — how much the page layout moves as content loads. Above 0.1 is poor; it is usually caused by images without dimensions, late-loading fonts, or injected banners.
Why it happens
CLS is a Core Web Vital and ranking factor. High CLS annoys users (misclicks) and signals a low-quality experience.
Step-by-step fix
Add width/height to images and embeds, reserve space for ads, preload fonts, and avoid injecting content above existing elements after first paint.
How SEO Surgeon catches it
Our engine flags pages whose engagement suggests layout instability and lists the most likely CLS causes per page type.
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