Technology is disclosed herein for optimizing data caches among multiple interconnected computing devices. According to at least one embodiment, a storage server transfers a first data set to a computing device. The storage server then identifies a neighbor computing device sharing a local area network (LAN) with the computing device. The neighbor computing device maintains a network connection with the storage server. The storage server transmits a second data set relevant to the first data set to the neighbor computing device. In response to a read request for the second data set from the computing device, the storage server sends to the computing device an instruction indicating that the neighbor computing device is storing a data cache for the computing device.