[elmerland]

Consider a page like wikipedia. Every time you click on a link to another article a new request is made, the page is loaded along with all its dependencies and resources.

A SPA would instead only get the text of the new article and write it in place. Therefore, removing the need to re-download the entire page again. You can also read about this in the blog post by bloomberg: http://www.bloomberg.com/company/2015-03-24/bloomberg-weve-m...

[pdwetz]

A little misleading since most of the non-article content (e.g. javascript, CSS) is cached locally by your browser. You can also utilize AJAX to have responsive user interactions as needed.