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Some more good info from the net! I dont know if you know about this links, but its good for everyone to take a look.

“Wolfire Games has an excellent blog post about “fast object instancing“. What they do is render the model a bunch of times, but send a different matrix for each object to a uniform slot.

This is a pretty efficient way to instance a whole bunch of objects, because you only have to send the data once (the biggest bottleneck when rendering a batch of objects will always be bandwidth) and then transform the model in a shader.

Fast object instancing link
GLSL pseudo-instancing pdf link

And some nice vid about WebGL Techniques and Performance https://www.youtube.com/watch?v=rfQ8rKGTVlg

Whats your opinion about Fast-object-instancing?