I was excited to install the trial of CS4 to see if it is what it promises to be...turns out its not (?)
I use Photoshop mostly for drawing, and when I draw using my tablet (or the mouse) the brush stroke is very unresponsive! and zooming, rotating etc is very slow as well... making it impossible to paint, even on a 500*500 100dpi canvas and a 20pixel brush size.

Im running it on a laptop,
core 2 duo 2ghz, 4mb cache
2 gig ram
geforce 8600m gt graphics
7200rpm hard drive

Ive tried different setting in pref -> performance -> advanced, such as turning vertical sync on and off, also forcing it on and of in the nvidia control panel.

There seems to be so many new features in cs 4 so I really want to run it, but if there is no solution....
Hope anyone has an idea!

PS, I have no problem in CS3!