Please Take a look at this video here: https://www.youtube.com/watch?v=JPi9ODl54Eg Explanation: When I press to delete a file and the dialog pops up, or I get a warning for something, the window that that pops-up up is empty (transparent) and it fully loads after about 20 seconds. However, if I wait and the popup loads, then If I evoke it again on the same window (e.g. I press delete on another file and a window appears to prompt me to send it to trash) it now loads instantly. The problem exists only in the fist time. So if I close that dolphin window which is now "fixed" and I open another, the problem appears again. This is the output of my inxi -Fxxx https://pastebin.com/K7ciSP8q Thank you !
Somehow the problem seemed to have fixed itself. I was having massive lag (system froze) spikes every minute that lasted about 15 seconds and I saw a process baloo_file_extractor that took up a lot of CPU. I deactivated the indexing function in KDE and now the lag has gone. Maybe the issue with the empty windows was somehow related. Anyway I hope this will help anyone having the same problem
I've seen an issue like this in KSysguard (the process overview, Ctrl+Esc) when I try to kill a process. I suspect it's phonon/gstreamer breaking because it plays a sound. I recall someone else mentioning this.