I decided that I'd install CS4 last week after using CS3 for the last year or so. However, what I wasn't prepared for was the serious sluggishness of Photoshop. My specs aren't top notch, but they're certainly not shabby either. I'm running a dual core 2.4ghz, with 2gb ram and an 8800GT graphics card. I had assumed that would be plenty. I tried turning the 3d acceleration off in the preferences, but the whole application just seemed sluggish. In the end, I decided to uninstall CS4 and go back to CS3, which works perfectly. I'm just wondering if anyone else has had these sort of issues. What specs are you using to run CS4?