The system will always "suddenly" be busy,
and I almost can't do anything in the X window.
even if I want to reboot, it's too slow to restart the computer.

also, I want to use "top" command to check my computer.
However, it's still too slow to show anything.

whenever I see my clock is slower than my watch, I know the system is almost down.

another thing i would like to mension is screensaver.
screensaver will certainly crash my system and I can do nothing.
perhaps a problem of my video card? (ASUS MX4000, nVIDIA)