Re: Even better...
That is better.
Browsers now have all the tools you need to make ridiculously fast and smooth sites. You can hint resource pre-fetchs and DNS look-ups. DOM fragments can be built and scheduled for insertion synced with the next frame. HTTP2 is a lot more forgiving when it comes to HTTP requests, which obsoletes old hacks like subdomain sharding. ServiceWorker opens up a whole world of intelligent caching, which gracefully degrades for older browsers.
BUT once you start including 3rd party crap, that all goes out the window. Those scripts never follow best practices, competitively thrashing the DOM. Welcome to jank city.
The funniest thing is, I've written huge native-like HTML5 applications, and after minification and compression, it's still much smaller than just one of those "social buttons". I can't understand how anyone can write bloat like it. Then again, I don't use jQuery.