The page is 320KB in size. They could have made it a static page with some simple HTML, the whole thing would have been under 10KB and would not have needed a CDN.
The thing that worries me the most, is that oftentimes nobody cares. That demotivates me a lot, as I tend to invest huge loads of my time into optimising various things, and all of them are meaningless if you ‘just buy a faster computer.’ Most of my websites are served with a low-powered computer, and I tend to optimise them to work well on them. But buying just one beefy server compensates all my optimisations. I have no idea what to do about that. I still care about these things, as I believe that’s what makes me a professional. But there are countless examples when you can just ignore all that and see no real difference.