There seems to be no real reason for the ue4 editor to run like it is on a 486 cpu. When I started with unreal engine 4.0 I had a dual core, it ran fine. Then about 4.8 I had to upgrade my video card and my cpu to quad core and a gtx 650, it ran fine. Now I have just upgraded to a gtx 1050 and a 8 core 4.0 MHZ with turbo and it is running like I am on a 386, it doesn’t even dent the cpu or ram… Throughout the last 3 years I have asked this very question and there simply has been no answer but “Send me your dxdiag” then no response. I don’t think optimizing their toolset is really a big priority.