The site is literally under a 1mb (300kb transfer) with almost no JS. This is what sites were like in the good ol days, there's nothing to load, nothing to process; it's basically just text and images.
Compare that to wordpress that has to run a bunch of PHP and JS every load. Blogger is like that hot tight college girl, she's light, doesn't have any baggage, but doesn't have any experience and can't do much.
And WordPress is like a 40 y.o milf. She does everything you can think of and more, but she's loaded up with baggage, barely keeping everything together, and is a mess under the hood.
Pros and cons, your choice to make which one you want.