X performance really choppy
okay, i'm running debian testing, kernel 2.6.0 and have recently installed a new xfx 5600. the newest drivers install just fine and X starts up (a little slow). however once x starts, it runs smoothly for about 6 seconds and then the cpu spikes up to 100%. this also happens whenever a window is dragged or even when the mouse is moved quickly. it makes it almost completely unusable. the cpu goes to 100% for about 5-10 seconds and them back to normal before spiking up again. i never had any problems like this with my old ati pci card.
right now i'm experiencing the problem while trying to run twin view though it exists in a single monitor setup as well.
please advise, i have no idea where to go from here
i've tried changing the NvAGP settings, set "IgnoreDisplayDevices" and other suggestions but to no avail.
xfx geforcefx 5600
512 mb ram
epox 8rda+ nforce2 mobo
debian testing, kernel 2.6.0
xfree86 version 4.3.0
my config file is attached