Xcode includes a performance tuning application named Instruments that you can use to profile your application using all sorts of different metrics. They have tools to inspect CPU usage, memory usage, leaks, file/network activity, and energy usage, just to name a few. It’s really easy to start profiling your app from Xcode, but it’s sometimes not as easy to understand what you see when it’s profiling, which deters some developers from being able to use this tool to its fullest potential.