I am going to present some of best approaches to improve the performance of ASP.NET applications.

You should think about the separation of your application into logical tiers. You might have heard of the term 3-tier (or n-tier) physical architecture. These are usually prescribed architecture patterns that physically divide functionality across processes and/or hardware. As the system needs to scale, more hardware can easily be added. There is, however, a performance hit associated with process and machine hopping, and it should be avoided. So whenever possible, run the ASP.NET pages and their associated components together in the same application.

Because of the separation of code and the boundaries between tiers, using Web services or remoting will decrease performance by 20 percent or more.