End-host multicast alleviates the deployment hurdle of IP multicast by building a transport level overlay for data delivery to all members in a multicast group, but at the performance penalty of higher network resource usage and higher latency in data delivery. In this paper we present a systematic approach to reducing latencies between members of an end-host multicast group. Latency reduction is achieved by adding links to an existing overlay network. We have developed several local heuristics ...