Those preview settings look quite moderate to me;  I wouldn't think they would be a problem, with your video card.  You might try setting the offscreen handling to scene window.

     For what it's worth, I frequently switch preview settings, using a quick/rough setting if the OpenGL/hardware shaded setting is reacting slowly, then switching back to get the best preview for a final check before rendering.

     Since your current project is reacting slowly, this won't be helpful, but for other scenes, if you're using tiled materials, or using procedurals, try engaging hardware shading;  this mode will display materials tiled (it helps you set scale and line up U,V offset) and show procedurals with scale, phase, and frequency.  It is the most demanding preview mode, so it will be the slowest.  But it's great for working up materials.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5