Tweaking mesh compression
Unity offers four different Mesh Compression settings for imported mesh files: Off, Low, Medium, and High. Increasing this setting will convert floating-point data into fixed values, reducing the accuracy in the vertex position/normal direction, simplifying vertex color information, and so on. This can have a noticeable effect on meshes that contain lots of small parts near one another, such as a fence or grate. If we're generating meshes procedurally, we can achieve the same type of compression by calling the Optimize() method of a MeshRenderer component (of course, this will take some time to complete).
There are also two global settings found in Edit | Project Settings | Player | Other Settings that can affect ...
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