Sometimes when viewing reports in Matomo your browser tab may become unresponsive.
For example in Firefox it may write
A web page is slowing down your browser. What would you like to do? "Stop it" or "Wait". In Chrome it might say
Page Unresponsive. "Exit pages" or "Wait".
This can happen when the report you are trying to view has too many rows and the browser loads too much data at once. This is likely caused by either selecting to view “all” rows or by selecting “make it flat” at the bottom of the report.
There are a few ways to stop this from happening:
You can try to click “Wait” in the browser, and see if it succeeds after some time. (You may have to click “Wait” a few times.) If the page succeeds in loading, you can then revert the settings manually that caused the problems in the first place (for example, selecting to display “10” rows only and click “Make it hierarchical”).
Or you can try loading the page on a faster computer and a modern browser, and then revert the settings manually that caused the problems in the first place.
If you are only experiencing the issue viewing one of your website’s reports, then go to another website where loading the same report works, and change the settings there.
Alternatively, and this solution will always work: you can reset the Matomo user settings for this specific user which experiences the issue, you can find the steps on how to reset the users settings in this FAQ.
When you experience this issue here is what it looks like in Firefox:
Or in Chrome: