I have noticed that when running a 1 hr sequence (wedding), my ability to use the CTRL D short cut for the default transition is VERY slow. I get the spinning wheel of death and then the transition appears. The time line runs fine but anything I do appears as if it is stressing the system out and it cannot perform. I have 16 gigs of memory on a MAC Pro. Any thoughts?
Don't you think that is obvious, get a PC...
You will have to forgive me, as my Mac-speak is horribly limited, but:
1.) what is your I/O sub-system set up, i.e. HDD's size, speed controller and how allocated? This is often the most important link in NLE work.
2.) what is you CPU speed? This is also important in NLE work. RAM is great, but not the end-all in performance.
In general, I've seen very few posts about CS4 being slow on a Mac. I'd offer a wild guess that it's your System's setup, or too many other programs running that saps the resources that any NLE will need.