Leopard iATKOS 10.5.7 with nVidia 8400 GS dreadfully slow.

[AeroCross]

Good afternoon people.

I reciently installed this copy of iATKOS into my PC at it works perfectly (with some minor stuff like sound not working with my Audigy SE, and not finding my other hard drive). The thing is that, when installing the nVidia kext via the installer, it works fine, and I think that Quartz Extreme works too, but when I use Exposé (Application Windows, Dashboard, etc) it renders HORRIBLY slow.

Is there some kind of nVidia kext that fixes this? Or any other suggestion?

Thanks in advance.