script on page bussy => jquery_update/replace/jquery.min.js

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: .../sites/all/modules/jquery_update/replace/jquery.min.js?C:12

I recently often get this error as a pop-up when loading a long Drupal admin page for example. First thought those pop-ups came from my webhoster, as they have the same form as those from my webhoster.

I'm not sure if this has anything to do with installing JSMin (and JSMin+) from Javascript Aggregator module. These options are disabled again, because they gave errors. Before I can't remember I had this specific error.