Unity provides a collection of shaders that are optimized for mobile platforms.
These shaders are located in the Mobile category within Unity.
While these optimized shaders contain simplified features, they have a better performance on mobile-based platforms. However, there are fewer features available, compared to standard, non-mobile, shaders. For example, these optimized shaders do not provide color tinting.
The following screenshot shows where you can locate the mobile-dedicated shaders, in the Mobile menu:
Only use features that are needed. Unity creates an optimized runtime shader version. This version removes unused features from the shader that is chosen and configured in a material. This reduction in shader complexity helps with performance on mobile platforms.