I ran compiz-fusion on my Compaq 2195US, which also uses an IGP 320M, and it was pretty snappy. Initial start times for Firefox was about 3 seconds, and OpenOffice would start in about 6. Cube rotation was pretty smooth, along with other animations. I run Xubuntu 7.10/XFCE. I normally leave compiz turned off; I like the processing power going to my apps rather than driving a pretty desktop. I have the Fusion-Icon installed, so I can switch back and forth with relative ease.
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