CS4 - clunky and sluggish - why?

Question

Just been trial testing CS4 with a keen view to buy. However - on my setup it feel sluggish. I notice the mouse pointer does not move smooothly and in pace with my mouse movements, making mask selections and cloning for example rather problematic.
CS2 work no problems. I am running on Windows Vista 32bit, with a 2.0gz dual core Pentium Dell XPS laptop, with 4GB RAM. A top spec graphic card with latest drivers too. Can't see why it should not perform equally as well as CS2. Anyone got any ideas, as I would really like to sue some of the new features in CS4.
Do I need to un-install CS2 first for example?
I noted also that some modules like MMX don't open properly when CS4 starts up.
Hope someone will have the solution.

Answer 1

Gordon, if you will take a week or so to wade through all 500 gazillion posts on this issue -- oh, never mind. You'll have no better idea what's going on than anyone else here.
Adobe engineers are definitely working on the problem, that's for sure. There have been numerous posts from them. Based on what a few engineers have said, there are apparently two camps inside the Photoshop command center: those who are pulling computers apart trying to figure out what's the problem, and those who are trying to figure out which video card maker, virus scanning software or numbskull computer user (that means you and me) to blame. Meanwhile, several of us have been asked to try out a test build of the program to evaluate for improvements. But it's obviously slow going, and with nothing new to report, the engineers have been very quiet since New Year. That's some long hangovers.
There will be a patch, I'm sure. But based on past experience with Photoshop updates, it could be a few more months away.