Of subsequent data fetches. Not the first page load. Using JSON fetches to update documents also gives you the ability to not throw away the DOM/CSS and maintain the execution context.
If you use the right technology, you can give a usable application out of the gate without waiting and use JSON data fetches for every subsequent request.
Comments
SPAs reduce the latency of data fetches because each new resource is a few bytes of JSON rather than some kb of HTML.
Of subsequent data fetches. Not the first page load. Using JSON fetches to update documents also gives you the ability to not throw away the DOM/CSS and maintain the execution context.
If you use the right technology, you can give a usable application out of the gate without waiting and use JSON data fetches for every subsequent request.