Public bug reported:

Binary package hint: ghc6

ghc6 is packaged with the bytestring library (libghc6-bytestring)
version 9.0.1 (on Intrepid, and I think, Hardy).  However, this version
has a performance bug that can cause quadratic behavior when you'd
otherwise expect linear.  If at all possible, this library should be
upgraded to a current version, and its dependencies recompiled.

See
http://blog.malde.org/index.php/2008/10/24/optimization-again-befuddled-by-bytestrings/
and
http://www.mail-archive.com/[EMAIL PROTECTED]/msg11509.html

** Affects: ghc6 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
libghc6-bytestring version 9.0.1 has a serious performance bug
https://bugs.launchpad.net/bugs/288601
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