What is most efficient way to render output of multiple cameras

[vitaly]

I have several rooms in my app. Every room has it’s own camera. I render output of each cam in small rectangle of screen. It runs ok on the pc, but very slow on my android smartphone.

all I do is set view rect of each camera.

How to increase performance?

[Montraydavis]

Layers : http://unity3d.com/support/documentation/Components/Layers.html