What is PLS by UTM Campaign
PLS by UTM Campaign lens breaks down Perceived Load Speed (PLS) by the utm_campaign parameter found in your marketing URLs. It lets you see which specific marketing campaigns (e.g. spring_sale_2025, product_launch, remarketing_push) lead to faster or slower perceived experiences for your users.
This lens helps you evaluate how well each campaign delivers on the user experience promise. A great campaign message can fall flat if the landing experience feels sluggish — and PLS helps you surface that disconnect.
Healthy PLS by UTM Campaign sample
Should you worry
A healthy PLS by UTM campaign shows consistent performance across all key initiatives, with no campaign standing out for poor user-perceived load speed. Minor differences are normal, but if one or more of your top campaigns show a noticeable PLS slowdown, it may be reducing their effectiveness.
High PLS values in important campaigns (like product announcements or retargeting efforts) could explain underperformance in engagement or conversion rates.
Unhealthy PLS by UTM Campaign sample
When this lens shows unhealthy results, one or more campaigns will stand out with significantly slower perceived load times. This could be caused by overloaded or unoptimized landing pages, heavier tracking scripts, or device-specific problems tied to campaign targeting.
Campaigns running across slower mobile channels (e.g. social or programmatic buys) are especially prone to poor PLS if the page isn't optimized for those use cases.
Resolving unhealthy PLS by UTM Campaign
Go-to action plan to resolve an unhealthy PLS by UTM Campaign:
Ask Uxi to analyze your PLS by UTM Campaign and suggest improvements.
Use Filters to isolate traffic from the slow campaign and explore common issues like device, connection type, or browser quirks.
Simulate LCP of the suspected lens to see if fixing it will resolve the PLS by UTM Campaign. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your PLS by UTM Campaign.
Once you’ve improved PLS, set an alert to be the first to know if it starts worsening again.
Try it yourself
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