Performance is a big factor in a successful project - especially in the Health Industry. Clinicians do not want to be waiting for software to run, they are busy saving lives!
There is a great tool I am sure most ASP.NET and ASP.NET MVC developers are using called MiniProfiler. If you are not using it - I highly recommend getting it installed today, even if just in your development environment (although I always have it running in test and production but restrict access to developers and some trusted power users).
