Preparing data in json on backend and populating data via ajax on frontend, what're the problems?

Preparing data in json format on backend 开发者_开发知识库and populating data to templates via ajax on frontend, what're the problems with this architect design? Assume all visitors use javascript-capable browsers, and we don't care about the number of HTTP connections that a webpage has to make.

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That architecture is fine, in fact it is the architecture enforced by some frameworks like javascriptmvc.

Just some comments:

• Depending on the complexity of the templates the rendering can be slow in the client side.

• If you have a lot of simultaneous requests from the same client to get data, they will be queued to keep a maximum of two simultaneous requests delaying the page load.