Low Performance on Server 2003 using Ajax

Question

 

Hi,I have a Ajax-based web application, and in Server 2003 it hangs, that's mean that responses get very slow and I don´t know. I isolate the problem and test a page without any ajax control, and the response was quickly. Eventhought I did the test between XP computers and the performance was  how I expect.

The problem is on Production Server when I use Ajax.

 

There is any security configuration that locks Ajax request  on  Windows Server 2003 ?

 

 

Thanks!-