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Mistake. The Factorio team is much bigger than a single developer https://www.factorio.com/game/about

And multiple of those devs have posted blog updates about various optimizations they've done. So performance isn't one person either.

Tangentially, kudos to them for listing out past team members on the about-us page. I've never seen anyone do that before.

that's like... what class looks like. real class not something you instantiate objects from :)