Hi Manuk,
Another thing that might be happening here is that your imported chain mesh is using auto-generated level of details (LODs) - Where the mesh is optimized to use less polygons the further away you are from it.
If you open the mesh in the Static Mesh Viewer, you’ll be able to delete the extra LOD levels. (Also in the viewer, you’ll be able to see the mesh/triangles change as your camera gets far away from the mesh)