When you start to optimize a game, first determine where the application bottleneck is. Intel GPA can help you do this with some powerful analytic tools.If your game is CPU bound, then Intel VTune Amplifier is a helpful tool. If your game is GPU bound, then you can find more detail using Intel GPA.To fix GPU bottlenecks, you can try to find an efficient way of reducing draw calls, polygon count,...
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Current Quick Reference Guide to Intel Graphics.