ScriptReference/PlayerSettings-bakeCollisionMeshes

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ScriptReference/PlayerSettings-bakeCollisionMeshes

https://docs.unity3d.com/ScriptReference/PlayerSettings-bakeCollisionMeshes.html

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Comment by @samnarain:

By default unity computes a physx mesh representation at load time. Unity does this on the loading thread, so it should not affect framerate when using LoadLevelAsync. However computing physX meshes can take time, thus Unity has an option to bake them at build time. This increases distribution size and decreases load time.
At build time Unity tags meshes based on usage (the meshes which are referenced by MeshColliders). Those either get the physx mesh "baked" flag when the option is enabled, or a flag that they will need to be computed on the loading thread.