The technologies relate to network management. Disclosed are network management techniques for optimizing delivery of content data (e.g., audio, map directions etc.) from a server to user devices by storing files having data (optional and non-optional content) according to performance characteristics (bandwidth) of the devices. Based on a highest performance characteristic of each user device, data that matches with the highest characteristic is automatically selected and is transmitted to the device. The technologies may be implemented as network management techniques, etc.