Same here, two different systems with Nvidia cards. Bug report it.

Partial fix. With the graphic driver at default settings Poser is setting the OpenGL quality really high for anti-aliasing and ignoring the program settings.

Close poser and open Nvidia control panel. On Adjust image Settings select the Use My Preference button. Slide the slider all the way to the left (Performance). This will get you some speed back but not to the level of Pro.