Any idea where to start to find out what it is?
EDIT: Just tried tossing my lighting build. No effect. Also tried multiple different scenes all with totally different assets. Still the same performance decrease.
EDIT2: Tried it on a few new empty maps with just a directional light, a landscape and some basic shapes. Same effect still… It’s most probably not my scene.
EDIT3: Disconnected my second monitor. Tossed some rendering settings around. Tossed some nVidia control panel stuff around. No change…