I don't agree with this categorization and it leaves out other important considerations: - Data structure and algorithm are of the same "algorithm" topic - So

I don't agree with this categorization and it leaves out other important considerations: - Data structure and algorithm are of the same "algorithm" topic - Some programming languages like Rust do not have tail-call optimization and so do not perform recursion well. You need to use the strengths of the language and avoid its weaknesses. - IO Optimization is another kind of optimization. Minimizing copies of data in memory, sharing whatever possible - Cache Optimization - design according to how CPU caches work with the operating system