I tried it on mobile. It still loaded fast. As with many pages, Firefox Reader Mode improved the experience. Though for me, the bulk of the improvement comes from text formatting, part of the improvement is hiding blog comments, ads, email signups, etc.
Anyway, my experience is that touching Firefox's reader-mode icon in the address bar is usually faster than a boatload of formatting logic; produces more readability than a website's general optimization, and bypasses all the ancillary crap that people concerned enough to optimize for mobile tend to add.
