The basic goals of Asp.net AJAX are :- 1. Reduce web server hits. 2. Reduce network load. 3. Interactive user Interface. 4. Platform and architecture neutrality. 5. Support for both synchronous and asynchronous communication. 6. Provide server and client side framework.
Reduce the traffic travels between the client and the server. Response time is faster so increases performance and speed. You can use JSON (JavaScript Object Notation) which is alternative to XML. ... You can use Firefox browser with an add-on called as Firebug to debug all Ajax calls.
1. Improving performance and efficiency by negating page postbacks 2. Introducing partial page updates to refresh only parts of a web page 3. Reducing the network load