I am getting pretty good frame-rates in MoP however I am seeing a lot of stuttering. Even when I am seeing 90FPS I will notice a lot of stuttering if there is a lot going on in the screen. The mouse cursor will often bounce and jump around which is the worst part of all as it makes the game unplayable. The sound also cuts in and out and garbles when this is happening as well.
The problem persists even if I run at minimum settings with reduced resolution and have audio turned off.
2011 27" iMac BTO with highest CPU/GPU
OS X 10.8.2
16GB RAM, 2GB VRAM
Razer Naga Hex (problem exists both with Razer Synapse running and without)
The problem also persists if I close all other applications.