problem with exporting the game to android

I created a trial 2D game in unity which consists of 4 scenes. In each scene there are several objects. Generally game is not very demanding in terms of components. The problem is exporting the game to android. The application stutters a lot as if it had 5 fps and the graphics deteriorates significantly. I tried to export the application to my computer and the game does not stutter but there are slight blurring of objects in addition I noticed that when I turn on the game the computer starts to howl, I checked what is the reason and it turned out that the application consumes all the graphics prosesor I do not know why. In the application (on android) were also strange errors among other things when scaling the buttons in the menu (they are very small) and the animation of loading the scene (also very small does not cover the entire area). It is possible that it is about "player settings" but I am not sure. I am focusing more on android so this is the problem I would like to solve the most.