The updating of an original version of a Web page without having to download the entire Web page. After accessing an original version of a Web page, a browser client detects that the accessed original version of the Web page is to be updated. The browser client then requests an updated version of the Web page from a page server computing system. Thereupon, the page server determines that only a portion of the updated version of the Web page is to be downloaded to the browser client, identifies that portion, and sends a response to the browser client that includes at least the portions of the Web page that have changed, but less than all of the Web page. The browser client then partially renders the updated version of the Web page using the portions of the Web page provided in the response.