Recently, there has been considerate interest in high performance networks. To help evaluate the high-speed-networking-related performance of supercomputers, we selected a computational neuroescience simulation program that has a bandwith requirement in excess of 1.5 Gigabits per second. The simulation runs on the thinking machines CD-2 and the target visualization engine is the convex C3880. We bechmarked the various operations required to transmit data from the parallel to serial data transformation operation on the CM-2 and the network interface are the major bottleneck