I know there exsits a Screen Percent feature in UE4. But the problem is it down-samples everything as you can see in the image on the right. So it has not any pratical usability for actual gaming.
I noticed there is a Render Resolution option in the game “Call of Duty: Advanced Warfare”, it’s similar to Screen Percentage in UE4, except it doesn’t down-sample everything, but only shaders, I guess.
This two images indicate the difference between various Render Resolution settings in “Call of Duty: Advanced Warfare”. They were all captured in 1024*768 sized window with just different Render Resolution. But the lower Render Resolution brought a huge frame rate boost without losing too many noticeable details. All geometry edges are looking as sharp as the native resolution, whereas current Screen Percentage in UE4 isn’t able to achieve that. It’s a fantastic option for most low-end hardwares. I guess they use a super-sampling method on geometry edges, whatever, I’m not sure about it. But I think UE4 team maybe want to do some research on it from professional perspectives. I really hope to see this feature in UE4. You know, the most complaints I’ve heared from people who decided not to choose UE4 for their new projects is “UE4 is not for low-end, even mid-end hardwares”. This will stop many people from trying UE4. After all the most games are not supposed to be AAA titles which only run on top hardwares in the world.