If you were to use the webservice running mode then all of the data would be fetched async and you would not have the data in the .aspx page (though you'd still have all of the init scripts).  There are arguments around having less HTTP requests, in which case having it in the page isn't necessarily a bad thing, though it does make the HTML look "ugly".

Maybe the better question here, what is the scenario and requirement to reduce this?  Is it just for appearances, or is there some sort of issue this is causing?