UE4 very laggy, why?

not only that it lags for me, I can’t have any animation. I always have to put shadow effect of low and couldn’t even read the note for a game because of the brightness. Is there a way to get it to not lag without buying a new computer or changing the shadow effect to low?

I have 2x GTX 1080’s and 128GB DDR4 RAM, with an i7 6800K Overclocked, it’s still unusably laggy for me… What am i supposed to do??

The IDE is laggy? Or the actually game previews…

I had to disable Sonic Studio on a similar rig to yours, and all the IDE lag went away.