Stereoscopy Rendering

When rendering stereo 3D, the engine loads all data for Left view, then it clears the memory and reload all data for Right view (nothing to do with "persistent data"). I think there's no need to load the data twice, since there'no way you can have different data from Left to Right view in the same frame.

Of course this would save a lot of time since in heavy scenes loading data might take longer than the render itself.