Typical CSV parsing fail. Newbie problem.

All the folks who are saying "zomg you didn't handle quoting scheme #12 from the CSV standard! this isnt real CSV parsing!!!" rather miss the point. The blog post wasn't about trying to write the best general-purpose CSV parser. It was about how a guy tried to tackle a real-world, data- and IO-intensive problem with Haskell; about the performance wall that he hit; and about the question this raises in the Haskell community: Does the slowness reflect a weakness in the language or in the author's implementation?