If you look at sites with a perfect #WebPerf score in #speedlify, most are hosted on Cloudflare or Netlify.
But you can get a perfect score without any CDN.
Look at one of my own #11ty sites, currently in position #34:
https://www.speedlify.dev/site/activites-nicolas--hoizey-com/
It's hosted by the great team at @alwaysdata , so I don't know if it really means it's "self" hosted, though. 😅