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In this page I am trying to collect all the issues that I solved from time to time, so that I remember how to fix those if needed.
The above picture belongs to this blog you might want to have a read: http://mschlander.wordpress.com/2011/01/23/kde-is-slow-for-dummies/
In systems running nvidia graphical cards, sometimes the video driver gets messed up with cached info. To fix this, run the following as normal user while logged in e.g. KDE:
nvidia-settings -a PixmapCache=0
Affected systems so far:
root@jarjar 11.4 ~> lspci | grep VGA 01:00.0 VGA compatible controller: nVidia Corporation G98 [GeForce 8400 GS] (rev a1)