For what it's worth, I'm also experiencing a substantial slowdown in CC. Scrolling through pages, dragging objects, selecting words and paragraphs; the basic actions one needs the software to be responsive to in order to be productive at one's job. It happens with new documents I create in CC and ones I bring over from CS6. My preferences and workspaces are the same in CC and CS6.
Here's what I'm running:
Mac Mini (mid 2010)
Processor: 2.4 GHz Intel Core 2 Duo
Memory: 8 GB
Graphics: NVIDIA GeForce 320M 256 MB
Monitor: 30" Apple Cinema Display
I'll check the forums periodically to see if there is any news on this issue. In the meantime I'll be going back to CS6 to get my work done. I hope the folks at Adobe are taking note of this.