We obtained the energy transport velocity distribution for a three dimensional ideal cloak

explicitly. Near the operation frequency, the energy transport velocity has rather peculiar

distribution. The velocity along a line joining the origin of the cloak is a constant, while

the velocity approaches zero at the inner boundary of the cloak. A ray pointing right into

the origin of the cloak will experience abrupt changes of velocities when it impinges on the

inner surface of the cloak. This peculiar distribution causes long time delays for beams

passing through the ideal cloak within a geometric optics descr iption.