What is LCP by cookie name
LCP by cookie name shows how the Largest Contentful Paint (LCP) varies depending on whether a specific cookie is present in the user session. This lens helps you connect LCP performance to segments like returning users, A/B test groups, logged-in states, feature flags, or marketing experiments - anything your site marks with a cookie.
Only cookies that were detected during the selected period are shown.
This is especially useful for identifying unexpected slowdowns tied to user groups or experiments. A feature might be working functionally but silently harming LCP for those targeted by a specific cookie.
Healthy LCP by cookie name sample
Should you worry
In a healthy lens, all cookie states - or the most relevant ones - show LCP values in the green. This suggests no cookie-based segment is dragging performance down, whether it's anonymous visitors or users receiving experimental layouts or personalized content.
If your key cookie groups (like logged-in users or A/B test buckets) load just as fast as the rest, you’re in a good spot.
Unhealthy LCP by cookie name sample
When one or more cookie groups show significantly slower LCP, it often reveals hidden performance issues that affect only certain segments of users.
These slowdowns are typically tied to:
Conditional content or features triggered by specific cookies (e.g., modals, banners, personalized UI).
Experimental or A/B test variations active only for certain users.
Logic that alters layout, delays rendering, or increases script execution time based on cookie presence.
Since these behaviors aren’t universally applied, they can quietly degrade LCP for a subset of users - often without being detected in standard testing. Identifying these cookie-driven regressions is key to ensuring a consistent and fast experience for everyone.
Resolving unhealthy LCP by cookie name
Go-to action plan to resolve an unhealthy LCP by cookie name:
Ask Uxi to analyze your LCP by cookie name values and suggest improvements.
Use Filters to isolate the slow cookie group, then review other lenses (like device or third-party) to find related slowdowns.
Simulate LCP of the suspected lens to see if fixing it will resolve the slow LCP by cookie name. If yes, this is where the resolution focus should be.
Use an automated LCP optimization tool like Navigation AI to improve your LCP by cookie name.
Once you’ve improved LCP, set an alert to be the first to know if it starts worsening again.
Try it yourself
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