i'm not even question that it is much more likely that the GPU is just not fast enough.
the reason i would look into it is that blur dif is the first step and blur dif usually takes 0.3 -1.50 ms on this screen it's 4.85 ms.
on the other hand i don't even know how he got it to be the first step.
edit: and the 580 is a pretty fast card when NGU isn't used which is the case here.
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