Gaming - jerky motion

Jerky motion on my SRMB MacBook 2.0 Ghz 2GB no other applications running in dock
It happens about every 45 seconds and has NOTHING to do with where I am in the game. It happens on most games, and at all screen resolution settings, whether I am on the Internet or not. Is there a process I can KILL to stop this? Or other simple fix? Otherwise, gaming is useless.
Thanks for any assistance!

I found the process in question by watching Activity Monitor while playing the game. Every time there's a 0.5 second pause in the screen updates, this process is active (about every 45 seconds). There are no other processes that activate during the graphics glitch. Every time this process activates, the graphics stop for a sec, so your player dies. Gaming is useless with this process running.
The process is: Update
Quitting it doesn't work. The OS just launches it again.
According to this list, it's "responsible for keeping disks synchronized with the file system cache, to keep data loss to a minimum in case of a crash."
http://www.westwind.com/reference/OS-X/background-processes.html

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