Unlike the 'get new stuff' dialog, there is no visible indication that the software is fetching resources from the internet, during a search, for example. This makes it impossible to distinguish between a search taking longer due to a slow internet connection, and a search not returning any results. Please add some kind of visual indication like a 'loading' circle, a busy cursor, a loading bar (maybe the thick blue line under the title could be repurposed for this), or maybe just a line of text in a corner.
This bug has been fixed by commit https://cgit.kde.org/discover.git/commit/?id=73b61fcdf1408871de85d60c7341e283194b92c6 Implement UI feedback for long-running searches, and no-results If a search takes longer than a couple of seconds, a spinner will face-and-slide in from the bottom of the view. If it then takes a while longer, a text saying "Still looking" will fade in very slowly. If the search is near-instant (the general case), the spinner does not show up. See also the Differential Revision: https://phabricator.kde.org/D5146