I think you guys need to put some system info in the thread so the problem can possibly be isolated. Is it Mavericks specific, for instance? What sort of hardware spec? You wouldn't expect an MBC to have performance issues. CC 2014 is actually supposed to run faster.
I've already tried turning off GPU acceleration, but it made no difference to SGs.
If anyone out there is _not_ having issues with SGs on a Mac with large documents with lots of layers, then PLEASE let us know your system specs. Seems to me that would be useful info.