Thanks a lot for all the responses to my question.

Before Poser 11 came out, I was desperate because of the limitations of Firefly. Superfly really opened up a whole new world for me and I haven't used Firefly ever since, except when I need some shadows for a photo background.
I understand that the speed of Superfly has doubled in Poser 12, which is a good thing, because all I could do to speed it up was throw more processing power at it. I also see the improvements on the different nodes, but I think unless pixel based displacement is introduced in Superfly, I will stay on Poser 11 for a while. Man, I really miss that feature. A lot.