How do you do website capacity planning? [closed]

Answer 1

While developing a recent Asp.Net MVC site, I used selenium to load test my site. Basically you record a selection of macros, in which you perform random tasks.

Then use selenium to simulate a number of users performing those macros. I tested my site with tens, hundreds and then thousands of users. This allows you to find trouble spots in code and in infrastructure before going live.