Since Opensuse switched to the Plasma 5 desktop (when selecting KDE), I experience very annoying short freezes.
This is going on for a couple of years now during different versions of Opensuse. Now I’m using Leap 42.2 and the problem
is still there. I haven’t tried Leap 42.3 yet because I always wait 3/4 months till most severe bugs have been patched.
The reason I post it now is because I found a way to reproduce the problem.
Open a directory with Dolphin that contains just a couple of files.
Open Okular and open a pdf (a random pdf that resides in another directory is fine).
In Okular, select File → Save Copy As… and save a copy of the opened pdf in the directory that is opened in Dolphin.
Immediately after doing that, switch to the Dolphin window. Dolphin will be frozen for 3 to 5 seconds before showing the
new file in the directory. If the Dolphin window was covered by the Okular window, the Dolphin window will be gray during the freeze.
The strange thing is, this happens just on one pc only. Another pc with the same software does not show this phenomena.
Also, only KDE apps show these freezes. All other applications not using the KDE framework never suffer from these freezes.
I already switched off search etc. All partitions on all harddisks are formatted with ext4.
I have separate partions for / and for data and /home like on another pc that doesn’t suffer from these freezes.