Standard Shader Vs Mobile Diffuse Shader

As per current mobile devices configuration which shader is better to use? I am losing framerates as per my current gameplay setup so I am thinking and applying different approaches to get better performance in the game.

So in this process, one thing I noticed that all models by default using Standard shaders and I was using them to run on mobile devices.

Like this way, I got all models with by default materials and standard shader attached. Each scene contains so many low poly models those in the combine generate a stadium, city streets and mountain environments.

At present, I was getting 30 FPS around on multiple android devices. Whether shader will create any improvement, if I switch to Mobile diffuse shader?

Here is game profile data:

Please give me some suggestion on this.