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To be clear, I'm not aiming to build the next Call of Duty; these days you can get pretty far building a medium-sized 3D game out of unoptimized JavaScript running on a web page. The GC optimization you mention is interesting to learn of, but probably irrelevant for the kinds of things I would be doing. Does that change your assessment of Haskell for this purpose?

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That depends on how large is your state. The GHC GC is normally fast, but gets slower the more objects you keep around. Lazyness can severely increase the number of such objects.

If your game has real time dynamics, it's not worth it. If it's some turn-based one without animation, it's not a problem.

Good to know, thanks for the info

Alternative opinion (self plug):

https://gilmi.me/blog/post/2018/07/24/pfgames

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