Good morning!
I think I can shed some light here. On some devices, we had removed the ability to change the graphics settings because the hardware is not powerful enough to handle the game at a higher setting. Many devices in this state when we tested became a “slide show” when playing on higher settings (that is to say the frame rate was horrible)
The sheer number of different Android devices makes it hard to optimize performance on. If you think you’re device should be able to handle a higher setting please let us/me know your device and we can check to see you haven’t been miss-classified.