The Secret of Keeping Web Apps Responsive

With AJAX becoming more and more common place on the web, old lessons need to be re-leant in order to create user interfaces that don't hang.

Anyone with any AJAX experience will be familiar with the problem. You fire off your AJAX request, you get your response, you update the page and everything is good… except it isn't. Updating the page takes forever and while that's happening the user can't do anything, not scroll, navigate to another page or even close the current page.
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