A backwards-compatible mechanism for reducing web page loading time is disclosed. A method includes forwarding, by a web server extension module of a server machine, a web page request to a web server component of the server machine, the web page request received from a client-side agent associated with the web server extension module. The method further includes receiving, from the web server component, page source code of a web page of the web page request, parsing the page source code to identify one or more resources associated with page source code, requesting the identified one or more resources from the web server component, compressing resources of the one or more resources that are received from the web server component into an archive file, and sending the page source code and the archive file to the client-side agent as one or more packages.