Performance profiling appears to have a high barrier to entry if you've never done it before. As part of some work for a client, I've been helping teach people how to profile code using JetBrains dotTrace. This slide deck is part of a larger session to help developers understand the numbers they're seeing so they can find performance bottlenecks in their code.

The embedded YouTube video is available here: https://www.youtube.com/watch?v=VrFeayu9LBk

JetBrains publish a wide variety of videos covering the use of their profiler, so I urge you to check them out if you're interested in deep diving.