Can you post a screenshot of your multiprocessor settings?
See images of all settings for the fastest of 3 machines.
12 core Mac Pro
128 GIGS OF RAM
2 Quadra 4000 mac gpu cards running parallel in a cubix break-out-box
Monitors being run one each off of each graphics card
Internal GPU card not being used for monitors.
Cuda drivers up to date 5.0.17
Ae update version 188.8.131.52
Are you in Ray-Tracing mode or Classic 3D? Try switching to see if there is a performance improvement.
Have not used ray-trace much other than to experiment. We primarily use classic 3d and that is where the issues seem to be. Basic GUI responsiveness. Especially with text tool.