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Onboard video is absolute junk. I don't touch it unless I'm building a Linux box that never leaves text mode. Most onboard setups use system RAM, which is not only slower than what's used in most video cards, but it reduces memory available to the rest of the system. And apps like Photoshop need all the memory they can get. Plus if you buy a machine that has onboard video, chances are the rest of the hardware is going to be really cheap as well.
I'd start by ensuring that all the drivers are up to date, and especially make sure that Windows is not using its generic SVGA drivers. If that doesn't help, I think a video card upgrade is in order. It doesn't have to be an expensive model; pretty much anything on the market would be a significant improvement.
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