The Pixel Processor get some nice optimizations on the Directx 10 engine (OpenGl engine on mac will come later). So this perf boost will only be available within SD as Unity/Unreal uses the CPU engine. You can expect this kind of performances on very complex functions:
We would need the sbs to find the cause. Would it be possible to share it with me (privately). Also, would it be possible to compare with the results in 5.2 at 2K resolution using the GPU engine, and in 5.2 at 2K using the CPU engine ?