In massively multiplayer online games (MMOG), large numbers of players connect over the Internet to join a common virtual world. With these games running in real time, there is an imminent need to synchronize the virtual game worlds of all players as tightly as possible to maintain user satisfaction. Noticeable differences in the synchronization among users due to end-to-end latencies or bandwidth limitations will negatively impact user experience. In most games, the relevance of information about game events for a particular player is shaped by the virtual world vicinity. Like in the real world, close events are more important than distant ones. Therefore, the highest communication demand is within local groups.