Yeah, it's true that performance can be so poor that the Haskell program can't get any useful work done. I was trying to express the spectrum from "perfect" to

Yeah, it's true that performance can be so poor that the Haskell program can't get any useful work done. I was trying to express the spectrum from "perfect" to "tolerable" to "pretty bad" (and "unusable" does belong at the far end), where all the old unchecked languages only offer a cliff between "perfect" and SIGSEGV (or "random output" if you're really unlucky).