The pre-rendering I am referring to is the contrast between server and client side page rendering. On my site with the first page load the server sends you a full HTML page so you don't have to wait for the JS to load, then the JSON to be fetched and then the HTML to render.

However, on all further navigation (if you are using anything but IE9 or less) I just request the JSON data from the server and I use handlebars via JS to render each page.