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There is certainly prior art for complex games running smoothly in Haskell: https://wiki.haskell.org/Frag

This particular solution used functional reactive programming, essentially a composition of signal/event processing functions/automatons.

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Ten years ago, that was the only substantial game written in Haskell. That you're citing that same game now is a bit telling.

Note the upload date:

https://www.youtube.com/watch?v=0jYdu2u8gAU

Ok here's a talk about making Haskell games that took place last week: https://keera.co.uk/blog/2019/09/16/maintainable-mobile-hask... I don't deny that making games in Haskell is niche, but it's certainly possible. Frag was just an example I remembered (ten years is recent for an old git like me).

If I remember correctly, in that thesis the author mentioned explicitly that the game didn't run very fast. If you watch the video from 2008, the in-game stats list framerates >60fps but the game itself is very laggy. Maybe there is a separate renderer thread?

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