I remember you can even use QR code to pay when shopping online. It is a great one since I never need to type my credit card information again and again...
This is awesome. I really don't understand why a new page would load so many stuff and then it hangs at some place. Sometimes I was wondering whether it was loading the whole world. Maybe we should take some steps back now to keep our site SIMPLE but COMPLETE. Just like Hacker News itself or Lobsters(https://lobste.rs) or Pxlet(http://www.pxlet.com/) so that we would not be distracted too much.
Maybe technically Google's AMP is a good help on boosting the loading speed but it only works on mobile devices and it takes much effort to make the site adaptable to AMP.
Usually a modern website would load lots of third party libraries, ads from different advertising platforms, social media sharing modules and analytic modules etc. All these would make lots of HTTP requests and increase the response time. How would they not be SLOW?