Hi,
I have the same problem in Illustrator CC 2014. iMac Retina, R295X, 512GB SSD, yet 8GB Ram.
Scrolling in a File, using the hand tool is very slow. To be said is, that it doesn't matter if
the file contains graphics (whether vektors or big pixel images) or is just an empty freshly created file,
also the artboard size doesn't matter.
What I also discovered is, if I scale the artboard to one third of the screen width, it scrolls fine.