never owning a Quadro, I haven't had any issues with graphics in ProE or CreoVBO should make a big difference as the geometry gets loaded to the card and the commands less verbose. VBO can render points, lines and triangles so maybe hidden lines is done some other way.
Also with data now being loaded to the card, GPU memory will be important when previously it wasnt - maybe your model is too big to fit in?
Do you get any cross section artifacts with edges turned on - my old Quadro has starting doing this with CREO2?
Does hyperthreading have an adverse effect on FEM performance?