Performance Engineering and architecture

I read some really nice article on performance aspects at:
http://www.codeproject.com/KB/aspnet/SitePerf.aspx

http://msdn.microsoft.com/en-us/library/ms998530.aspx

http://www.codeproject.com/KB/aspnet/10ASPNetPerformance.aspx

Some really nice facts of the performance and scalability aspects were brought forth by these articles.