Performance tuning ASP.NET applications

I have an ASP.NET application where one of the pages has a Save button to allow the user to save their work. So I have a client running the application in Internet Explorer, a separate IIS server running IIS version 6 and a separate SQL Server 2000 server where the data is saved in a database.
Some users are experiencing major performance issues during the save process. I'm looking for any pointers to articles on the web which can help me analyze/determine where the bottlenecks are in the entire process, i.e. is it a client problem, IIS problem or SQL Server problem.
Any help on how to do this would be greatly appreciated!
Thanks!!

Here's a few online resources related to ASP.NET performance:
ASP.NET Performance Overview
Improving ASP.NET Performance
ASP.NET Performance
Getting Started - Enhancing Web Site Performance with Caching
Optimizing Performance in ASP.NET
Developing High-Performance ASP.NET Applications
Hope these links help.

-- Erik Reitan
ASP.NET User Education
This posting is provided "AS IS" with no warranties, and confers no rights.

Om Sri Sai Ram

Performance :
http://msdn.microsoft.com/practices/compcat/default.aspx?pull=/library/en-us/dnpag/html/scalenet.asp

Caching:
http://msdn.microsoft.com/practices/compcat/default.aspx?pull=/library/en-us/dnbda/html/cachingarch.asp
Thanks,
Ram