mythical android 3d models optimization

This is the question of optimizing the game (perhaps about a miracle-optimizing button that I do not know about)

As far as I know CSR Racing 2 is made in Unity

And the car model has about 30 000 triangles, in my garage is 6 cars, 30 * 6 = 180 000 triangles + garage. All this is displayed in 1280 * 720 and gives 60 fps, including amazing shaders, textures and effects.

Why is my cube that I created for the test having 100,000 triangles, gives 20-30 frames when I run it, without textures, effects and with a shader mobile diffusion.

What a magical button I lost, I tried a lot of options for building, adding linear and gamma light, nothing makes a difference.

My device is Nexus 5, snapdragon 800, but this is not important, because I compare 2 games on one engine and on one device

 

Here it is, now gives me 28 FPS, 100 000 verts, 200 000 tris. Just one model.
How i can optimise this project?

https://drive.google.com/open?id=1WQlyJui4qfUnXiEss_22uqlX3DXxjnA0