Disadvantage of Ajax

1. Back functionality cannot work because the dynamic pages don’t register themselves to the browsers history engine. Hence the need of Iframe becomes essential.
2.  The page cannot be bookmarked if implemented using Ajax.
3.  If java script is disabled , Ajax will not work
4.  Because different components of the pages are loaded at different times, response time may be slow.
5.  Because different components of the pages are loaded at different times it may create confusion for the user.