We also go to multi light and real time tone mapping.
Please remember multi light need to be render (it take more time then usual rendering because noise information must be very clean in some regions) ...so this is no real time rendering


Remember also curve noise effect: ...first seconds of render is under value 20 after that takes forever. So in VPR it gives feeling like real time render but really good quality (acceptable) is after 10-300 min (depends from hardware).
Anyway Corona is for me always good example how should look render engine
