Abstract: An intermediary system reduces a delay associated with the compression and transmission of content resources to a user's device. For example, the intermediary system compresses a first content resource, generates a signature of the first content resource, stores the compressed first content resource and the generated signature, and transmits the compressed first content resource to the user's device. When the user's device or another user's device requests a second content resource at a later time, the intermediary system generates a signature of the second content resource and compares it with the signature of the first content resource. If the signatures match (meaning the first and second content resources are very likely identical), then the intermediary system merely transmits the compressed first content resource to the appropriate device instead of first compressing the second content resource and then transmitting the compressed second content resource to the appropriate device.