Exactly. And understanding WHY you should prefer using a Struct (or class) instead of a dictionary / hash-map. Can you feel the PAIN of all that additional cost

Exactly. And understanding WHY you should prefer using a Struct (or class) instead of a dictionary / hash-map. Can you feel the PAIN of all that additional cost?? The Python / JS world is all dictionaries. Such a developer might never understand why their language runs slower.