Browser takes long time to render html controls asp.net

I have an aspx page showing lots of information in a tabular format on ajax tab container. Approximately 3 to 5 tabs are used. I have used some of AJAX controls such as CalendarExtendar, ValidationCallout etc on page. My problem is that the page is loaded fast but the browser takes long time for rendering the controls. On my local system the page loading takes around 8 seconds while on server it is taking about 25 seconds. I have also disabled the viewstate wherever applicable and even compressed the viewstat开发者_高级运维e using gzip.

Have you tried monitoring your call in firefox's firebug Net tab? There you can dissect the transfer in detail and see what part of your page is taking how much time. Also the YSlow plugin will give you some sound advice on improving the performance of your pages.