The first time I saw the hair system in blender, I was able to style it in the particle editing view without much of a problem. That was on a cheap laptop. Now I'm working on a system with two bridged hybrid GeForce GTX 980 TI's, 32 GB of RAM, and a Core i7-5930K 6 core CPU clocked at 3.5 GHz. It can handle any game I throw at it without a hitch. But ask it to edit a couple hundred hair particles? Maybe a hair here and there will change before Blender crashes. It doesn't matter if I put it in CUDA mode or not. I'm at my wits end here.
If I disconnect the hair from the emitter, I can manipulate it freely. Except, I really can't have the hair disconnected from the person's head.