@mboelen Very nice!
The guide above is more the basic-level stuff that anyone can reasonably implement. It's more about avoiding the 4 mb Elementor crap and getting it down to 100-400 kb instead. :D
I think people don't always realise that a lot of it IS easy enough to implement.
RE: More extensive guides, I'm part of the W3C Sustainable Web Interest Group - anyone is welcome to contribute to the Github.