Editor UE4 Lag

Hello, I have a little problem. My Unreal Engine lag, it does about fifteen FPS, but not on the IG preview window where it does 120 FPS. Only in the software menus.

But I have a good configuration, I do not understand.

I7 4790k
24 GO RAM
GTX 980

Do you have a g-sync monitor? The editor is not compatible with g-sync and it needs to be disabled.

I don’t know how to see that :confused: