DX 9 Windowed - Bord 70- 100 fps \\ DX 11 Windowed -Bord 30 FPS Full Screen: 70-100

As i described on the title When i play on DX9 client windowed or borderless i have from 70-100 fps (theres some microstuttering but not a huge deal..depending on the area etc).

On DX11 i have permanently around 30 FPS on windowed no matter what graphics settings...BUT on fullscreen it goes back to my normal FPS...

Any ideas?

System Specs

Laptop Lenovo Y50-70
Inter i7 4700HQ @ 2.40GHZ
8 GB RAm
GeForce GTX860M
Samsung SSD 850 Pro

DirectX works better in full screen - unfortunately that's just the way it is. Also, if you have crossfire that will only work in full screen on DX11. I know that doesn't apply to you as you have Nvidia but it may help someone.