i tried to load this on a zenphone 3, but it crashed, i think its my phone that is geting old due to too much usage, not godot fault, because i also tried on a samsung J7 and... it works!
im not sure about the fps, i dont know how to measure, it probably isnt great but looks fine when i move the camera arround.
this samsung j7 was worse than the zenphone in almost every app that i triend on it (plenty of things wont install or open), its the base model where they left you with almost no free space to install stuff.