Is it normal for both screens to go black for about 3 seconds while alt + tabbing?

[Deniedstingray]

Sorry for the long title, but that is the question

 

[The_Staplergun]

Yes if you're in full screen. The reason is in Fullscreen it stops rendering everything else. It has to technically load and then render the other objects when you tab out. It may also have to adjust to the resolution.