The web's basic user experience doesn't seem to have changed much over the last six months, but behind the scenes, sites are packing on the pounds. You're now downloading an average of 678 kilobytes when you go to one of the web's most popular sites, 88 kilobytes more than in October of last year.

The new data comes courtesy of HTTP Archive, a new site that will provide a long-term record of how "digitized content is constructed and served." It's conceived as a technical counterpart to the Internet Archive, which catalogs the actual digitized content.

The graph above comes from a list of about 1,100 popular URLs.