Jerky mouse when cpu spikes

Hi guys n girls,

when my cpu spikes, my mouse movements get jerky, esp when hard disk is going, then it can move around a bit by itself.

Keyboard can also have a delay between typing and the letters appearing on the screen.

Is there anyway of stopping this? Its so incredibly annoying, particularly when trying to locate a button i need to press in a certain amount of time (anyone here play online poker?)

Surely i can make my system give a bit more resources to my mouse and keyboard, and a bit less to everything else?

Have searched on google, etc, but all jerky mouse enquiries simply come up with 'clean ball' 'buy a laser' or 'dont use laser on glass'

All help much appreciated

About 3years old, just put 3Gig ram in, AMd athlon64 3500+ 2.21Ghs. Up to date , regularly defrag hd.

Have always noticed a bit of lag, but is more noticable now im having cpu spikes when playing poker.

Keyboard can also lag. Its so annoying, as the computer is obviously aware of exactly where the mouse and keyboard are doing, (as it eventually 'catches up'), but it obviously thinks thinks something is more important

It only happens when cpu is spiking, or under heavy load

mouse is controled by south bridge, it could be tempature problem.

I have been getting the same issue with W2K. I have exhausted all my ideas in dealing with it.
I get a lag that is system wide, mouse, keyboard, what ever, that lasts for less than a second, and occurs every 3 seconds. System information shows me a spike from 2% to 21%.