Asset auditing

Question 1

Using AssetPostprocessor

Answer 1

OnPreprocessTexture
OnPreprocessModel
OnPreprocessAnimation
OnPreprocessAudio

Question 2

Common Asset rules

Answer 2

Audio
Platform-appropriate compression settings
Force audio clips to mono
Reduce audio bitrate

Question 3

Textures Import Settings

Answer 3

Disable the read/write enabled flag
Disable Mipmaps if possible
Compress all Textures
Enforce sensible Texture size limits
POT or Atlas
16bit Color Format over 32bit
Max Size to Minimum

Question 4

Mesh Import Settings

Answer 4

Disable the Read/Write enabled flag
Disable rigs on non-character models
Enable the Optimize Game Objects option on animated models
Use Mesh compression when possible
Disable Blendshapes