What is INP distribution
INP distribution lens breaks down your pageviews into 50ms intervals along the Interaction to Next Paint (INP) timeline. It shows how responsive your site feels across the full range of user sessions — from snappy to sluggish.
INP measures how quickly your site reacts to a user's first interaction, such as a click or tap. The distribution chart helps identify whether most users experience responsive interactivity, or whether delays are more common than they should be.
Healthy INP distribution sample
Should you worry
A healthy INP distribution forms a declining slope — most pageviews fall within the fast-response (green) zone, and fewer occur as interaction delay increases.
Watch for spikes in the middle or right side of the chart. These are warning signs that some users are seeing lag when trying to interact.
Also check the P75 marker. If it's not within the green zone, you’ve got room to improve — especially for 25% of your user base.
Unhealthy INP distribution sample
An unhealthy INP distribution may show an unexpected hump or rise in the yellow or red zones — indicating a significant number of users are waiting too long after their first interaction.
Common causes include:
Main-thread blocking from third-party scripts.
Poorly optimized interactivity components.
Delayed hydration or event handling.
Resolving unhealthy INP distribution
Go-to action plan to resolve an unhealthy INP distribution:
Ask Uxi to analyze your INP distribution values and suggest improvements.
Use Filters to find which user types, devices, or pages are causing the spikes.
Simulate INP of the suspected lens to see if fixing it will resolve the INP distribution. If yes, this is where the resolution focus should be.
Use an automated INP optimization tool like INProve to improve your INP distribution 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.