UE4 performance for embedded linux platforms

Hi,
Recently I was able to get UE4 sample to compile and run for Linux ARM platform, specifically nvidia’s jetson TK1.

Running SunTemple at 1280x720 resolution though the performance tops out at around ~22 fps max.

Profiling using “stat unit” seems to show that it is heavily GPU bound. For example:
Frame: 54 ms
Game: 5 ms
Draw: 27 ms
GPU: 54 ms

I’m in the middle of looking into how to optimize this further now but I have several questions maybe someone can help with:

  1. Has anyone else ever done this before ? If so, what kind of perf do you see ? Just as a reference.
  2. I read that the SunTemple demo is geared for mobile platforms so I was hoping to get better perf. Is there some kind of performance configurations that should be turned on when compiling UE4Game intended for mobile platform ? How about settings in GameUserSettings.ini file for SunTemple ?

Thanks