Ive been using KDE since .... 4+ years, I think its great and ok, but Ive found few things to improve::

1. Upon connecting new hardware there is an icon in tray telling you that new hardware has been connected with small window popping out upwards. Ok, but take a closer look at it - the apperance of this window is not smooth - halfway up it freezes for ~1s and than it continue to roll up.

2. When selecting multiple icons on the desktop the grid appears. Upon releasing mouse button, sometimes the cursor does not return to arrow. Its random.

I will note here anything strange that pops up.

Thanks.