You are correct, that purely functional data structures are slower, but the differences is not as meaningful as you might actually think. Haskell is actually pr

You are correct, that purely functional data structures are slower, but the differences is not as meaningful as you might actually think. Haskell is actually pretty fast, and I'd say for the vast majority of applications, Haskell is just fine performance-wise. See a few examples here: https://two-wrongs.com/on-competing-with-c-using-haskell https://two-wrongs.com/on-competing-with-c-using-haskell