Changing sharedMesh in MeshCollider causes lag

Hi,

I make changes to my mesh, and want to update the MeshCollider after I'm done. The problem is that it causes a lag of about 1-2 seconds. The whole program freezes for that time, I cannot move the camera, nothing.

I tried to circumvent this issue by putting the code for the mesh replacement in a Coroutine. But that doesn't have any effect.

If have no problem with the update taking 2 seconds. But I need to find a way to react to it (like displaying a text "Updating..."), and I still want to be able to move the camera and do other things while it is updating the mesh.

Here is the code snippet I'm using. The coroutine is called in Update when a mouse button is clicked and a raycast hits the object (that updates currentMeshFilter).

 IEnumerator ApplyMeshColliderCoroutine(){
     applyingMesh = true;
 
     if(currentMeshFilter != null){
         GameObject go = currentMeshFilter.gameObject;
         MeshCollider mc = go.GetComponent<MeshCollider>();
 
         mc.sharedMesh = null;            
         mc.sharedMesh = currentMeshFilter.sharedMesh;                
     }
 
     currentMeshFilter = null;
 
     applyingMesh = false;
     yield return null;
 }

I did some tests taking the time using System.DateTime (because Time.time didn't work), and what causes the lag is the line

 mc.sharedMesh = currentMeshFilter.sharedMesh;

Any help greatly appreciated.