Why would you assume that? Most websites bloated or otherwise don't need to keep a socket open 100% of the time to function at all, and I strongly suspect most

Why would you assume that? Most websites bloated or otherwise don't need to keep a socket open 100% of the time to function at all, and I strongly suspect most sites that do use websockets also pass considerably less over the wire in absolute terms than this does when it's rendering stuff like those fancy progress bars.