Sudden Decrease in INP urls

[Vinay]

Hi all,

We are facing a sudden decrease in good INP urls moving to need improvement URLS from Aug 13 2025 despite not having any major feature release.

Also urls with status 301 moved permanently to different domain are also appearing under the results of another domain. This happened on 24 Aug 2025.

example of url with 301 Status -> https://collegedunia.com/exams/questions/match-list-i-with-list-ii-list-ilist-iidescription-666aef3e6f744977facbf73a

[Barry Pollard]

We are facing a sudden decrease in good INP urls moving to need improvement URLS from Aug 13 2025 despite not having any major feature release.

As INP measures the user impact of web browsing, it is impact by both the website itself, but also the user population. This means even when the site doesn't change, their metrics can still change if the user population changes. For example, if you run an ad campaign or have a post go viral, and get an influx of new users with different characteristics to your previous user population.

This can particularly happen if you are close to the Core Web Vitals thresholds, where small shifts, can result in flipping back and forth between Good and Needs Improvement. I notice your INP is at 202ms in the screenshot which is just over the good threshold. So this may be a small regression, rather than the large regression it appears as.

When looking at the historical data for https://collegedunia.com it appears to me that the good INP was actually the anomaly and this is a reversion back to where it has been historically:

Also urls with status 301 moved permanently to different domain are also appearing under the results of another domain. This happened on 24 Aug 2025.
example of url with 301 Status -> https://collegedunia.com/exams/questions/match-list-i-with-list-ii-list-ilist-iidescription-666aef3e6f744977facbf73a

I'm not sure I understand. Are you saying these https://collegedunia.com results now appear under the new domain? Isn't that what's expected?

Or are you saying they still appear under the old domain? That's also expected for a short period as CrUX includes 28-days of data.

Or are you saying they were redirected a long time ago and have started re-appearing under the original domain?

Also if you did redirect a lot of traffic to a new domain, that is also a change to the site that could impact INP (maybe those pages had good INP and were pulling up the average, but now no longer are).

Also be aware that Google Search Console questions are out of scope for this forum (they have their own forum) but obviously with Core Web Vitals data there is some overlap so we can try to explain it as best we can, especially if we see the same in non-GSC CrUX data.

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