3D View
This is the main 3D Renderman display. Dragging around this window will cause the plot to rotate. The current azimuth and altitude are displayed in the upper right corner of the screen (unless you make to window too small). If you are still moving the mouse when you release the left button, the plot will continue to rotate on its own. 
If you leave the plot rotating, the program (and the computer) will slow down considerably. 

Wireframe mode is considerably faster than smoothed mode. I would suggest using it when it is reasonable to do so.