Very poor performance in the editor using multiple monitors

[Cosmik-Debris]

@Chosker

I’m on 4.18.1 but also happened on 4.18.0. I run on Win10.0.1506, and I have a GTX 970 with driver version 388.43 (was the same with the previous driver)

if you’ve launched UE4 with -DX12 in the command line (with a shortcut or a batch file) then you’re using UE4 with DX12, otherwise UE4 is running with DX11

I’m on 4.17.2 but I tried 4.18.2 and it’s exactly the same. I have windows 10 1709 and gtx 1080 driver version 388.59. I’ve even considered switching parts in my PC or upgrading my motherboard and CPU to try and fix it, hoping that it will make a difference somehow. Strange that my laptop that also has a 1080 and exact same version of everything works perfectly, it only loses a couple of fps when I open a new window.