I’ve found out that turning off the Shadow’s in point of light made it lag free. (i’ve also tried other lights e.g Spotlight etc with shadow on and it’s fine no lag at all.) Seem’s like people using GTX 970/980 is having exact problem.
If Epic Games could Update / fix this would be amazing
Odd, I only got my 970 a few days a go, so really haven’t had much of a chance to use UE4 with it, but decided to give it a go. I noticed no impact in performance in game or editor, even with 20 shadow casting point lights.
If you pay close attention to the pictures you can see my CPU usage is out of the roof and my GPU is in idle mode. I hope the Devs will soon figure out what is going on because it is a serious issue and i see that it affects more and more people over time.