you know, your igp probably is stealing all your RAM as variable video memory. if you put an extra gig or two of memory into your system, you'd see a huge difference. if you can get me the model number of your system, i'll bet i can find you a good deal for under 30$ for more memory. it'd be like night and day.
my old laptop was in a similar boat when i first got it. only had 512 mb of ram and a video card that varied from 64-256mb. i stuck two 1-gig sticks into the system and sped it up by half.