Non-existing performance in apk built

Hello everybody.

We are developing 3d enviroment for a board game. The project is almost done, and the .exe compilation works nearby to perfection but .apk goes down from the very first moment. To my eye looks like the processing tasks were too much for my phone, but the 3D models and terrain aren't any exaggeration, and my cell is, in fact, quite fast. I don't think it could be any programming problem, cause there is not much to care about the code.

I don't really know what to take into account, what are we missing. It's quite important, in fact our task is to compile the android application. I don't know, maybe somebody has any tip or any advice for us just to push us out from this hole.

Thank you very much for the time you took to read to this point, have a good night and see you tomorrow.