How to fine tune an asp.net application and find bottlenecks

How can I test performance of an asp.net开发者_StackOverflow社区 mvc application and understand where exactly the bottlenecks are? I see some tools from redgate but to get the package is about $700. Are there any cheaper alternatives that may work? Or simple ways to really fine tune the application to maximize performance in a less expensive manner?

Thanks.

Sure. There is one stackoverflow created called MiniProfiler.

http://code.google.com/p/mvc-mini-profiler/

http://www.hanselman.com/blog/NuGetPackageOfTheWeek9ASPNETMiniProfilerFromStackExchangeRocksYourWorld.aspx

If you're using VS 2010 Ultimate you have access to some decent performance testing tools that are included. Many time bottlenecks only show themselves when the application is under load. The tools in VS let you correlate the load test with performance counters on the server hosting the app. This in combination with the MiniProfiler tool mentioned in another answer would be a good combo for finding bottlenecks.

http://msdn.microsoft.com/en-us/library/dd293540.aspx