According to an article at Mobiforge the average size of web page is now (roughly) the same as a Doom install image [mobiforge.com]:
Recall that Doom is a multi-level first person shooter that ships with an advanced 3D rendering engine and multiple levels, each comprised of maps, sprites and sound effects. By comparison, 2016’s web struggles to deliver a page of web content in the same size. If that doesn’t give you pause you’re missing something.
Doom, id software's classic first person shooter from 1993 [wikipedia.org], has an install image size of 2393kB for the shareware MS-DOS version [dosgamesarchive.com].
The article uses the information from The HTTP Archive [httparchive.org] on page sizes which shows an average size of 2301 kB for April of 2016, only 92kB smaller, and sizes are still increasing.
Originally seen at Hackernews [ycombinator.com] and also at The Register [theregister.co.uk]