Why does $.getJSON() block the browser?

Question

I have a page where I list hardware devices we monitor for customers. Each row displayed also shows the status of the device i.e. whether it\'s running, paused, starting up etc.

Answer 1

Turns out this isn't a problem with the client side:

Would multiple calls to the same ASP.NET MVC action cause the browser to block?

Would multiple calls to the same ASP.NET MVC action cause the browser to block? - Answer

This was being caused by a "by-design" feature of ASP.NET where multiple requests made in the same session are serialised.