When I dealt with this level of 3D stuff a couple of years ago. Changes in texture have been the most expensive things.
AFAIK, changing the matrix is cheap, material expensive. But I can be wrong for todays hardware.
 
 
 
At the moment I'm grouping objects based on the model transforms, so that I'm minimizing the change in the model transforms. Would grouping based on material be more effective ?
 

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