It is amazing how quickly a simple, traditional, "collection of pages" type website actually works if you don't do annoying things to slow it down. Most websites would be absolutely fine if a) HTTP was used reasonably well to set things like cache headers, and so (as mentioned in the article) and b) if a load of user-irrelevant stuff like tracking and advertising code wasn't thrown in as well. A simple page with standard HTML, passably optimised assets where needed, and only the JS needed for actual functionality, should be almost instant on most modern connections.
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