I may be very wrong here, however, since hair (as a particle system) is, I think, calculated
rather than statically attached to a model, it can't just move with the model. Otherwise, AM
would have to be constantly calculating hair and other particle when a model was selected or
being moved, which would get even more complicated when dynamics are used. It at least
appears to be thus, regardless of hair density or use/non-use of dynamics. So I doubt screen
resolution or window size would make a difference.
Lowering the real-time density wont change that, but will help manage the amount of
"lines" and time if you have a lot of hair without changing the final render.
That is if you want/need to see it in non-render modes.
Just remember, the space bar is your friend with hairy models...
Hope that helps...