I just created four basic models  2 from Poser 6 and 2 from Poser 7. One from each has strand based hair and the other transmapped. The models are nudes. 

My OS is XP Pro. I have 4 gig of Ram on an amd 64. The memory usage was bad. Here are some of the figures. I started out with 90%. 

Jessi tr hair 76% purge 78%  deleted her - no change
Sidney tr hair 61% purge 68% flushed history 67% 

The strand based hair was a total wipe out. While it imported, it was so slow, I gave up and the resources droped to 42% for jessi and 38% for Sidney.

Each time I started fresh at 90%.