A process is provided for providing network content to a client computing device by one or more content providers in conjunction with a network computing provider. The client computing device requests a network resource from the network computing provider. The network computing provider processes the network resource request to identify embedded resources associated with the network resource, and determines whether any version of the network resource or associated embedded resources are available in a cache or data store associated with the network computing provider. The network computing provider provides the determined available content to the client computing device for storage or initial processing, and requests the most recent version of the network resource from a content provider. The network computing provider may obtain any additional content from the content provider or a content delivery network provider.