Switching meshes

Hello,

In my game I made a button that toggles when it's stepped on and it works fine. Then I made the button change the mesh (mesh filter) to a different mesh for when it is toggled and not toggled. Now when I run the game it starts to lag after a few minutes and then it freezes so I have to force quit it! I've tired clearing the mesh, recalculating the bounds, recalculating the normals, but nothing seems to have an effect. When I comment out that part of the script it works again.

Here's the code:

 if(!isToggled){        
     if(GetComponent(MeshFilter).mesh != T)
             GetComponent(MeshFilter).mesh.Clear();
             GetComponent(MeshFilter).mesh = T;
             GetComponent(MeshFilter).mesh.RecalculateBounds();
             GetComponent(MeshFilter).mesh.RecalculateNormals();
     }else{
         if(GetComponent(MeshFilter).mesh != notT)
             GetComponent(MeshFilter).mesh.Clear();
             GetComponent(MeshFilter).mesh = notT;
             GetComponent(MeshFilter).mesh.RecalculateBounds();
             GetComponent(MeshFilter).mesh.RecalculateNormals();
     }
 }

If anyone knows what I'm missing, any help would be greatly appreciated!

Thanks!