This will depend greatly on how the scene is arranged, but it can't help being faster in almost all cases, because the Poser 7 method of division of labor is just very bad.  There isn't any way to guess a flat +X% increase to speed, because (for example) if you render a flat square of one polygon and no textures/transparency/whatever, there will be no room to improve on the old version - however if you have a scene in which all the "difficult" stuff is in one quadrant of the camera frame, it would be many times faster.

It's good news to hear this will be improved, although it's a bit tragic it wasn't implemented that way in the first place.

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