Yes, i remember this case. Unfortunately we could not find the cause of the problem. I think is not a network issue, but a display problem, because in the video is clearly visible how Max redraws (slowly) each control in the rollout. Anyway, you would try installing Forest Lite (which doesn't use license) to check if there is some difference.
If this is a display problem, there is not much that we can do, because the rollouts and controls are handled directly by Max. We use mainly Quadro cards here, but i will ask to our collaborators that use GTX cards.
I think you already tried it, but how does it work using Direct3D instead Nitrous ? Do you have installed some software that would affect the display performance ?