[Haskell-cafe] Need help - my haskell code is over 50 times slower than equivalent perl implementation

Dear cafe, I have created a reproducible app here - https://github.com/ckkashyap/haskell-perf-repro Essentially I am trying to open a number of files and printing out their sized by reading them in and computing it's length. I have the equivalent perl program also there. I'd appreciate it very much if someone could take a look at my Haskell implementation and point out what I am doing wrong. Since it's over 50 times slower than the perl code, I assume I am doing something obviously incorrect. Regards, Kashyap