For everyday app development, its not often that array performance is something youre thinking about. Perhaps if youre implementing an algorithm that needs to scale well, performant arrays might be on your mind. Maybe youre working on lower level code, in a framework say, where any performance deficits will have a compounding effect. For the occasions that it does become relevant, its nice to know a little more about the options we have. Lets take a deeper dive into arrays in Swift.