Cart - Single Page

Hi There,
from my exploration, cart and chekcout page for ecommerce should be using single page application to minimize page displacement, so users don't have to wait for a long time to reload the entire page. anyway the both page need same information (Ex: payment total, shipping info, etc)

Hope you guys will like it. Your feedback and appreciation is always welcome and don't forget to press "L" button :)
Thank you.