The front page of reddit (not logged in) is 11 MB, logged in it is 17 MB for me (variable based on media-heavy subreddits and ads). Facebook's login page is 8 MB. Hell, Google's front, once a bastion of efficiency (long since fallen), is 9 MB.
It's sad how 19 MB now doesn't even register for me in today's bloated web.
I do appreciate that it puts up a warning instead of starting automatically, maybe not so much for the 19MB part, but for the fact that it plays sound.
Play the (only?) WASM demo at https://midzer.de/wasm/duke3d/ (ported from https://github.com/GPSnoopy/BelgianChocolateDuke3D). Miserably only software rendering right now.