Abstract: A client executes a resource such as a webpage or software application including modules that are received based on information about the resource. The resource includes tags that can be replaced by modules specific to the resource. To decrease the time it takes to prepare a resource for execution, the client requests a set of modules known to be previously requested for the resource. The client can replace the tags with the modules from the requested set of modules, without needing to first parse the resource to determine which tags are in the resource and require associated modules.