ASP.NET Tips #39 - Before optimizing code, profile the app so that you know where bottlenecks are

This is something that is said in many places but I want to repeat it once again because it's so important. Even using the new profiling tools in Visual Studio 2015 to analyze performance issues in your application will help. With an expert profiling tool like Telerik JustTrace or ANTS Performance Profiler, you'll find out a lot more about the bottlenecks that are there – and be able to do a lot more, a lot faster.