Off topic: This is the state of web we are in, and this is coming from Google. [1] I have literally 20% of the screen displaying useful information. The others are all useless navigation or related crap. Just seeing it nearly got me to puke. It is one those problem in general where the web page is responsive and mobile first. [1] https://ibb.co/fCfmW6h
The extra wide padding on the sides is still wasteful, but it is not as bad as your experience.
However, none of the javascript on the page is executed, because I also run NoScript in default deny mode, and for the screen shot, all the JS is blocked. It looks like the javascript is partially responsible for part of the extra you are seeing.
Yes, testing with javascript allowed, it is the javascript that is adding the fixed top and bottom banners to the page.