Abstract: Application performance in cloud-based virtualized environments may be improved by migrating partitions executing within the cloud between servers. When an application spans multiple related partitions spread out on different servers within the cloud, related partitions may be migrated to the same server or nearby servers to reduce input/output (I/O) delay in communications between the related partitions. A method for improving performance may include analyzing a network traffic log to identify related partitions. Then, communications costs may be calculated for the related partitions and a partition selected for migration to a new location in the cloud.