Pol favor :), UE4 is very very heavy in editor on video cards. I have said this long time ago and I always compare software to other similar software, Unity runs twice as fast as UE4 in Editor, In all our cases and on multiple machines with latest drivers UE4 suffers and suffers even more on dual monitors, soonest you have Material editor or a live BP running on the second monitor the editor tanks further.
Yes I’ve been told update drivers or something is wrong with the setup blabla. It is a fact guys the software is slow and a bloated mess. It comes in with more features turned on by default than anyone would want to use them for and it just keeps getting more bloated with every update. Not to mention the huge icons everywhere.