I have been working in a web project(asp.net) for around six months. The final product is about to go live. The project uses SQL Server as the database. We have done performance
There can be a million reasons for that; use SQL Profiler and Query analyzer to determine why your queries are getting slow before going down the "schema change" road. It is not unlikely that all you need to do is create a couple of indexes and schedule "update statistics"... ...but as I said, Profiler and Query Analyzer are the best tools for finding out what is going on...