I have a R9 270x running on the newest driver 16.8.3. and since like 2 or 3 driver updates ago my FPS in windowed borderless mode in League Of Legends is abyssmal. Like it doesn't use my graphics card at all. Going into fullscreen gives me the expected 180-200+ fps. I tried adding a new profile with the league exe in the crimson program with the hope that it would recognize windowed league as a 3D application. It didn't work :/. If it doesn't have anything to do with the AMD software I could only imagine the Windows 10 anniversary update as the remaining culprit.
Thanks in advance for any answers!