It's difficult to tell what is going on without more information. There might be a high-poly object in your environment that is causing the framerate to drop when it comes into view. The only difference between the nvisorSX and nvisorSX111 commands is the field of view that is applied to the window. the nvisorSX111 has a larger FOV, so that means more objects are visible. If you bring up the onscreen frame stats, how many polygons/drawables does it report?
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