Performance degradation after KDE runs for sometime

[Armelius Cameron]

Hello,
I've been noticing that KDE performance degrades after it runs for a while on 
my machine. Since I am the only user, I usually never log off, and just let KDE 
runs for days at a time (I just lock the screen when I have to leave the 
desktop). I do restart some applications, e.g kontact, kopete, Firefox just in 
case I need to login to my mail (IMAP) or IM services from another location.

After a day or two, I would notice that Desktop switching is not as 
responsive. Scrolling the list of folders or messages in my Kontact / Kmail 
feel sluggish. Most obvious are desktop effect stuffs (e.g. show dashboard, show 
all desktops). As anectdotal example, show dashboard would take 4-5 seconds 
after I hit the shortcut before it happens. Displaying / drawing windows, for 
examples, if I want to change my preferences in Firefox or Kmail or starting 
xterm or konsole, is also less responsive. It's not unbearable, but the 
degradation is there for sure. 

Log off (restarting X) and re-login usually cure the problem. If I happen to be  
too busy and have too many windows / apps open, I can still bear this for a 
while, so it's probably not show stopper, but it's rather annoying.

I am running F13 - x86_64, fully updated. "Help --> About KDE" shows KDE 4.5.2 
is installed. I am using proprietary nVidia driver from RPMFusion, running 
dual-desktop (twinview). I don't think my hardware is the problem since it's 
rather beefy machine: Nvidia Quadro NVS 295, 2 quad-core Intel i7 with 16 GB 
RAM. 

I am just wondering if anyone else see the same thing. I am curious if this is 
KDE's problem, or X with/or Nvidia-driver interaction.

Thanks.
AC