The overall feeling is the editor is slow compared to Unity editor, does anyone have same experience ?
What hardware are you using?
-go into the quick settings and turn down the quality settings
-make sure that you run your PC with the “high performance” settings
-make sure that you run your pc with the right gpu 
All right, i turned the effects from Epic to medium on a scene using many objects and shaders and it helps a lot; let’s keep high settings for production game testing only.