I downloaded the 5.6.1 engine and noticed that when I hover over the UI, the performance starts to sag a lot, although the scene is empty, the laptop is not loaded, this is noticeable when I hover back into the viewport and the fps stabilizes, what could be the problem?
I think this is an editor optimization. If your view is not on focus or is minimized the frame-rate drops sharpy to save resources/battery. I’m not entirely sure why would you loose focus when just hovering on the menus but it is possible.
I don’t think this should be a cause of concern but you can check anyway.
I looked around the properties and couldn’t find the setting though. Maybe someone else knows where to turn that off to see if it is really the causer of the frame-rate drop or something more is happening.