KDE4 slowing down as it's used
A while ago I finally switched to KDE4 as my main desktop environment because it finally seemed stable enough and was for long attracted to the integration and features available in KDE, not to mention it tends to look less dull than GNOME.
And I've been through a bit of cynical mood as far as computing goes which partly helped me stick with KDE even with a few issues popping up here and there. I basically gave up searching for perfection since apparently no such thing exists nowadays in the whole software industry (I even tried Vista and Mac OS X btw).
But one issue I'm having with KDE is really testing my patience.. after a while of use (not necessarily a long while, few hours may be enough), KDE becomes inexplicably sluggish to the point where just typing either in firefox or in kate or probably just about anywhere else begins to feel like dragging weights across the desktop. As I type letters appear with delay.
Aside from that similar sluggishness happens when I do such things as resizing windows or just moving a sidebar in kate left and right. It's not smooth at all, but again feels like playing a 3D game at less than 10 frames per second.
This also seems to happen regardless of whether I have desktop effects turned on or off, and since I can only use free drivers on it (since Ubuntu Jaunty) the drivers are basically incomplete and unstable so even when I have my desktop effects on, all actual effects are turned off and only transparency remains. If I didn't do that the desktop would freeze completely on certain occasions, requiring hard reboot.
Anyone had these kinds of slow down issues using KDE4? Any ideas what could be causing it?