Many users are expereinceing perfomance issues with CC, and Adobe is working to fix those that are not related to inadequate hardware.
You haven't told us a thing about the machine on which you're trying to run CC...
Mac Pro with Dual-core Intel Xeon, 2.66GHz
9 GB memory
Could be the hardware. Which OS? Was it a clean install?
Make sure you set Live Screen Drawing to delayed or never, turn off Live Preflight, and turn off page thumbnails. If that doesn't help, you may be one of the unfortunates who are waiting for Adobe to solve the problem.
OS 10.6.8 and yes it was a clean install.
Have done all your suggestions previously and still same problem. It appears to be worst when moving type, or even just typing in text.
So its partly linked to how the fonts are being re-drawn on screen?
I have no clue.