Low performance on AMD GPU. Please Fix it!

[pablobiernik]

When I had an NVIDIA graphics card installed in my computer, the games always worked fine! 
But since I have an AMD graphics card in my system, I notice a significant deterioration in performance (low fps).

I do not understand how to solve this.
I have the latest drivers.
My video card is 280x.
I tried to lower the graphic quality, and is the same.

My friend has a 270x card, and has the same problem.

I repeat: with an NVIDIA card games operated successfully (GTX 560 Ti, 660, 670).

Is there something I need to configure?

Thank you!

[Helios]

If you're on an AMD GPU, use the Direct3D backend and the latest development version.