we've been struggling and trying everything. Our Unity Gear VR apps run much slower on the S7 than on the S6. Where we have 60 fps on the S6, we barely get to 30 fps on the S7, which is totally weird.
We tried Unity 5.3 and 5.4, latest Oculus Utilities and "native" VR, even on Unity 4.7 the S6 is faster than the S7.