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Very insightful! I myself tried to make ofNode matrix caching to make deep hierarchies faster and it worked out quite okay. It'd be good to have a more efficient ofNode offering the same functionalities, it being such a core class and also procedural's github name!
There is a clear tradeoff between readability and efficiency in oF code and that's actually okay given the nature of most users.
Anyhow, thanks for the addon!