Pose everything BEFORE loading any hair(if you havnt found that out already),it just about kills my system loading up a heavy piece of Dynamic hair(P4 2.2 w/ 512 RAM). If you are making your own and are trying to play with curls, try setting the Kink Scale up to 1000 from the default 100, I have had much better results. (Again, if making your own), the higher the resolution of the base scalp object, the lower the number of hairs you will need(which helps with the system slowdown). I took my scalp objects and subdivided them once or twice each. Hope all this helps someway, glad to be of assistance.