Keep Sites Running Smoothly By Avoiding These 10 Common ASP.NET Pitfalls

Straight from msdn magazine:
Keep Sites Running Smoothly By Avoiding These 10 Common ASP.NET Pitfalls -

1. LoadControl and Output Caching
2. Sessions and Output Caching
3. Forms Authentication Ticket Lifetime
4. View State: The Silent Perf Killer
5. SQL Server Session State: Another Perf Killer
6. Uncached Roles
7. Profile Property Serialization
8. Thread Pool Saturation
9. Impersonation and ACL Authorization
10. Don’t Just Trust It—Profile Your Database!

Check this: http://msdn.microsoft.com/msdnmag/issues/06/07/webappfollies/default.aspx