I tested one render and on Poser 6 and wow...it was quick!  I'm going to do a more intensive one later with higher render settings. 

Library display was quick and overall, P6 ran quite quickly, so I'm guessing P6 and P7 work very well with some users having reported some problems with P8.

For Poser 6 users, just tested and everything opened fine on Snow Leopard.  Render screen took a little while but will test renders to see if there is improvement, slow down or any instability.