Correct me if I'm wrong

This post touches on a few learnings I had: First, that our intuition about where the performance bottlenecks are is not always right. Second, third party libraries are not always the best solution for your problem, no matter how convenient it feels and how much you want to trust them. Corollary: Measure performance before and after using them to identify bottlenecks. Third, sometimes your own naive and inefficient solutions are just good enough and no optimisation is required.