According to "view document size" from my firefox "web developer extension":

  www.reddit.com: 4285 kb
  old.reddit.com: 1888 kb
  i.reddit.com:   802  kb

Im not 100% confident those stats are really getting everything on the page but it seems about right. Anyway, perhaps you are sensing that the junk/cruft to content ratio is rising.

Assuming 5 kWh per GB of data[1], and 14 billion reddit pageviews per month [2]

  # i.reddit.com
  5 kWh/GB x 1e-6 GB/KB x x 1e-9 TWh/kWh x 802 KB/view x 14e9 views/month x 12 months/year
  = 0.67 TWh/year

  # old.reddit.com
  = 1.6 TWh/year

  # www.reddit.com
  = 3.6 TWh/year

So about 3 TWh extra electricity is being used each year. This is about the total used each year by Papua New Guinea, which is ranked 133/219 in electricity consumption by country.[3]

And for what? What did we gain from this?

[1] https://aceee.org/files/proceedings/2012/data/papers/0193-00...

[2] https://expandedramblings.com/index.php/reddit-stats/

[3] https://en.wikipedia.org/wiki/List_of_countries_by_electrici...