Why is slower than on the glDrawElementsInstanced iPhone6 glDrawElements?

When draw the fate of trees or flowers, we try to use instantiated drawing, since the objects differ only by their matrices to model.

However, we noticed that on the iPhone6 and iPad Mini 2/retina that performance degrades when using instancing compared to several batches of drawelements. Other systems that we tried on responds very well to drawing instantiated, so it is a bit strange.

Is this a known problem which does not support the iPhone6 instantiated drawing correctly or is it not that we missed to activate something or similar?

See you soon!

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