Debian User Forums • View topic - Make A Choppy Desktop Feel Smooooth
If you set Xorg's nice value to -1 you will make it more important than any other process. Xorg is what draws the mouse (and the windows). If you go to /etc/X11/Xwrapper.config and change the last line from "nice_value = 0" to "nice_value = -1" and reboot you will be greated by a smooth as glass desktop.

Bottom Line (forgive the pun)

Change /etc/X11/Xwrapper.config from "nice_value = 0" to "nice_value = -1

Others have tried -8, DeepDayze said it made kde4 run faster than kde3. So give it a try.
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