I'm James Webster, a software developer specialising in mobile games. Most recently I've been developing in Unity using C#, however in the past I've worked extensively with Objective-C and Xcode. Given the time I'd like to learn how to use Swift for iOS development.
I'm a strong believer in writing easy-to-maintain code. Present-me has sworn one too many times at past-me for implementing quick solutions rather than maintainable ones. I favour readable, clean and quick to write and maintain code over super-optimised, intricate and slow to create programs.
You seem to be concentrating on optimisation too early. You should favour readability over efficiency at this point.
When your app seems to slow down, or near the end of a release, profile the application and find out what, if any problems exist. Otherwise you may find yourself spending a day "optimising" a for loop to find that you've saved 0.000001s per update.
Moreover, readable code is easier to:
That's not to say "don't optimise", rather concentrate on optimising the biggest problems.