Can I use threading for MeshCollider`s sharedMesh?

Can I use threading for MeshCollider`s sharedMesh?

MeshCollider`s sharedMesh in runtime is very slow. So, I was threading for that, but Unity log error message that ‘set_sharedMesh can only be called from main thread’.

Please help me.

Nope, unfortunately. MeshCollider is part of the Unity API which has never been threadable. It is on their roadmap, however;