Very poor performance in the editor using multiple monitors

General Feedback & Requests
25

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