I also found P8 does run very well on my older Powerbook under 10.5.6. , 1.68Ghz and 2gig ram.

Poser7Pro also ran well .

P6 was a total 'pita' on it ...  I gave up for the better part of a year it was so bad.

But hey , what is a disaster for some seems to work for others so there is no telling.

P8 is very nice though .

" Try and be nice to people, avoid eating fat, read a good book every now and then, get some walking in, and try and live together in peace and harmony with people of all creeds and nations."
-Monty Python