Hi Rob, There is a limit to how well you'll be able to get things to scale given the hardware limits you have to work around. If you don't want the main rendering loop to wait for the rendering of all these extra views then you'll need to use a separate viewer(or compositeviewer) with it's own threading. You'll need to manage your own frame loops in the secondary viewer.
The only reason to copy data is if it the data is being modified by the different threads, I wouldn't recommend avoiding any modifications of the scene graph so you can simply share it all without copying. If there are modifications you currently need I would suggest looking at ways to move this work elsewhere - often you can move to the GPU and just pass a Uniform per View to select the settings that are approriate so the shaders can do the right thing. Cheers, Robert.
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