Thanks for the response.
Since using CS6 I’ve noticed the green “ram precache” bar fills up whenever it can. I believe this is the new Global Performance Cache feature. Problem seems to be when it does this, it runs expressions constantly, leading to sluggish performance.
that’s just my theory, I could be totally wrong.
The underlying problem is that Projects that have expressions that ran fine in CS5 and 5.5 are now sluggish and unresponsive in CS6. I’m using an octo-core Xeon mac pro so i don’t think it is the computer. And the bar is staying green, so its not writing to a disk cache.
thanks again for the help