In games you can use direct x etc and get the video card to do a lot for you. Those graphics processors are amazingly fast. Poser doesnt do any of that for the final render, although it will use mutliple processors if you have them.

What spec system do you have now, and what are you thinking of , also what version of poser ? 

You might try the poser 4 renderer rather than firefly. See what change in render times that gives you. Or I suppose run your make movie using the preview renderer, thats very fast.