using CS2 with XP professional, lots of space and ram.

i have made several of the recommended adjustments for making CS2 run a little better
with good results.

now the only thing that is ridiculously slow is using the eye dropper tool. when using it by itself to sample a color, or within other tools (Replace Color, Select using Color Range,etc.)
it appears that there is a lot of 'thinking' before the color is sampled.

in all previous versions of Photoshop, this was never a big deal.--in fact, instantaneous.

Is there a setting i can tweak? Bug? Does anyone else have this problem?

thanks in advance, - big john