Unity Game Optimization - Third Edition

Using Read-Write Enabled appropriately

The Read-Write Enabled flag allows changes to be made to the mesh at runtime either via scripting or automatically by Unity during runtime, similar to how it is used for texture files. Internally, this means that it will keep the original mesh data in memory until we want to duplicate it and make changes dynamically. Disabling this option will allow Unity to discard the original mesh data from memory once it has determined the final mesh to use, since it knows it will never change.

If we use only a uniformly scaled version of a mesh throughout the entire game, then disabling this option will save runtime memory since we will no longer need the original mesh data to make further rescaled duplicates of ...