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This State of the Haskell Ecosystem doc[1] is very informative. If you're looking at application domains, Haskell(and OCaml etc) is usually well suited for writing compilers, but its not bad for your usual server-side application either. The only domain its fundamentally unsuited for is systems/embedded programming.

[1]: https://github.com/Gabriel439/post-rfc/blob/master/sotu.md

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My impression from having tried it briefly is that it's not great at real-time stuff because of its lazy evaluation. Do you find that to be true, or is that not an issue in real life?

Lazy evaluation does make understanding performance/memory behavior hard, but usually you'll be using pipes/conduit/machines instead of lazy lists in production code, so its not much of an obstacle for real-time behavior.

However GHC's garbage collector can be an issue for real-time code, having high 99th percentile latencies.

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