What is CLS by UTM Campaign
CLS by UTM Campaign shows Cumulative Layout Shift (CLS) values across different UTM campaigns (e.g., promotion_easter_start). This lens helps you spot which campaigns are leading users to visually unstable pages, affecting trust, engagement, and conversions.
Only UTM campaigns that drove traffic to your website during the selected period are included.
High CLS can come from campaign-specific landing pages, late-loading banners, or dynamic elements that shift after page render.
Healthy CLS by UTM Campaign sample
A healthy CLS by UTM campaign lens is all green — indicating that campaign visitors experience stable layouts. Some campaigns may perform better than others, but unless you see yellow or red, there’s no need to worry.
Unhealthy CLS by UTM Campaign sample
In this example, app_gdpr_request shows poor CLS. That means users clicking through from this campaign are likely seeing layout shifts after the page begins loading.
These shifts may be caused by:
Banners or announcement bars injected late
Lazy-loaded images without dimension hints
Fonts or third-party scripts displacing visible content
Even a small shift in layout can cause frustration — especially for users arriving from marketing campaigns with intent to convert.
Resolving unhealthy CLS by UTM Campaign
Go-to action plan to resolve an unhealthy CLS by UTM Campaign:
Ask Uxi to analyze your CLS by UTM Campaign values and suggest improvements
Use Filters to isolate the slow campaign and review other CLS lenses (by page, device, etc.) for patterns
Simulate CLS of the suspected lens to see if fixing it will resolve the CLS by UTM Campaign. If yes, this is where the resolution focus should be.
Use an automated CLS optimization tool like Navigation AI to improve your CLS by UTM Campaign values
Once you’ve improved CLS, set an alert to be the first to know if it starts worsening again.
Try it yourself
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