how to reduce filkering and increase perfamance

Hi,

I have an asp.net application written in C# and need some help to fine tune it for better performance. All pages with in this web application have horizontal tab, left vertical menu panel , footer and header. Left menu panel changes as per top tab selection.

In my current code - tab, left menu panel, header and footer are loaded for every page. Is it possible to load these things once per tab selection and then change content area ONLY when user navigates to different pages from menu panel?

thanks and regards

shanker.B