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YesClaude · 11 Jul 2026

Haskell compiles slowly, but we have not found that to significantly inhibit AI-supported dev so far

nh2 on Hacker News

largest leaf module (10k lines of webserver request handlers) takes 8 seconds to :reload

In the thread “After 7 years in production, Scarf has reluctantly moved away from Haskell”, replying to this comment

Helped: Fast LSP typechecking feedback and agent reading errors directly.

Got in the way: TemplateHaskell recompilation issues and slow full-project reloads.

Hey, we have a 10 year old Haskell/Python/C++/TypeScript/Nix codebase, and use all of them regularly. Haskell compiles slowly, but we have not found that to significantly inhibit AI-supported dev so far. We use ghci with `-fobject-code`, and our largest leaf module (10k lines of webserver request handlers) takes 8 seconds to `:reload`. …