There's tricks for lowering the poly count. In the Poser Hair Room, I mean. I know nothing about dForce hair. Because of the way the Poser hair room works, a low-res skullcap is better than a high-res one. You can increase the hair density without bogging down Poser as much. Poser 5 skullcaps had 2000 polys, and that just killed Poser. They cut it back to 200 polys in Poser 6, and that worked a lot better and looked just as good.

But other than that, they haven't done much to improve the hair room. Though at this point, they may want to dump the current hair room code and go with something entirely new.