What is INP by scroll behavior
INP by scroll behavior shows how Interaction to Next Paint (INP) differs based on whether a page was loaded fresh, had scrollable content, or was restored with a previous scroll position (e.g., using the browser’s back button).
This lens helps identify whether interaction responsiveness suffers during back/forward navigations, or when the page has significant scrollable content.
Healthy INP by scroll behavior sample
Should you worry
A healthy INP by scroll behavior distribution looks like this:
INP is fast across all scroll states — including when restoring previous scroll positions
Scroll-heavy pages don’t degrade responsiveness
Back and forward navigations are just as snappy as new page loads
This indicates your scripts, layout rehydration, and event listeners are resilient — even when dealing with browser-managed scroll restoration.
Unhealthy INP by scroll behavior sample
If INP is worse for Scrollable, Scrolled pages, it's often due to:
Slow hydration or event binding after a back-navigation
Input handlers delayed by excessive DOM complexity below-the-fold
Heavy JS on scrollable views, affecting interactivity after restoration
Scroll anchoring conflicts that interfere with timely paint after interaction
This affects return visitors or power users who rely on history-based browsing — a segment you don’t want to frustrate.
Resolving unhealthy INP by scroll behavior
Go-to action plan to resolve an unhealthy INP by scroll behavior:
Ask Uxi to analyze your INP by scroll behavior values and suggest improvements.
Use Filters to isolate the problematic state and pinpoint specific templates or paths.
Simulate INP of the suspected lens to see if fixing it will resolve the INP by scroll behavior. If yes, this is where the resolution focus should be.
Use an automated INP optimization tool like INProve to improve your INP by scroll behavior values.
Once you’ve improved INP, set an alert to be the first to know if it starts worsening again.
Try it yourself
Discover how your website performs with real user data.