The OP is right, wider tires are crazy slow. I have a 31 mile loop (with ~1,300ft of elevation) that I ride a couple of times a week. Takes about an hour and forty on my Cervelo (on tubeless 23s) but with wide tires? Woof, it takes forever. Could be as much as 6, even 8 minutes more. Just rode it a few days ago on 700x35s and it took 1h48m... oh, that bike also only has one gear.
...and just in case anyone missed it, this was <sarcasm>
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