Offloading execution of a portion of a client-side Web application to a server. In one embodiment, for example, a computer-implemented includes identifying a function to-be-offloaded in a client-side scripting language file; generating an offloaded function based on the function to-be-offloaded; replacing, in the scripting language file, the body of the function to-be-offloaded with client RPC stub which, when executed by an end-user computing device as a result of a call to the function to-be-offloaded, causes one or more arguments passed into the function to-be-offloaded to be marshalled and sent to a server in one or more network messages.