Here's the deal: I was originally using CS2 on my iMac, which ran fairly well, but I noticed there was some brush lag; by brush lag I mean that the stroke I'm making when drawing something is slightly behind the movement/position of my cursor. It's not a huge lag but it's noticable and pretty annoying. Anyways, I thought this might have been a problem with CS2 and the lack of support with the Intel processors (which I have), so I upgraded to CS3 today, and I notice it has the same problem. I've tried everything from resetting preferences, to reinstalling and upping the cache levels and photoshop memory usage. I have 1gig of RAM (plan on upgrading to 2 soon), a 1.83 Intel Core Duo processor, and around 100 gb of hard drive space left. Everything else in photoshop is running a smooth as can be and even the load time is as fast as ever, so I'm really perplexed here. Has anyone else had this problem or know of a fix? I've also used CS2 on my PCs with the same specs more or less and haven't had this issue.