Rendering static content client side using JavaScript is a bad idea, even if you have fast network in terms of latency and speed.
The main problem with this AJAX antipattern is, that it blocks all spiders and search engines. So you should not do that, if you are not Google docs, who can inject the content into their own search engine, and wants its content not to appear on other search engines.
As a rule of thump: Do not use JavaScript for anything that should be indexed by a search engine. Instead use JS only when interacting with humans, e.g. for blog comments, checkout and payment. Hiding comments by making the comment system AJAX might be a good policy for a blog, if you do not want the comments to appear in search. But the blog posting itself should be static content.