FPS problem?

Hello guys,

I have a problem with fps,

I play my game in new window mode in editor,i get 88fps.

I play my game in new window mode in editor but i send unreal engine to background and i get 44fps

Also,i package my project and i get 44fps too.

How can i fix this?

What is this,is it a error?

http://i.hizliresim.com/gXkNzL.png

http://i.hizliresim.com/ZYLrgA.png (this is while i’m playing in new window mode)

It could just be the complexity of some of the scenes, there are a few scene packs on the marketplace that can reduce my FPS count 75% with a GTX 970/16GB RAM