#12248: Simple program that runs 100x slower using Text or ByteString vs. String -------------------------------------+------------------------------------- Reporter: dsf | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Core Libraries | Version: 8.0.1 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by rwbarton): * status: new => closed * resolution: => invalid Comment: Yes, because `String` is a linked list so you can efficiently prepend a short `String` to a long `String`, while (strict) `ByteString` and `Text` are flat arrays so prepending a short one to a long one requires copying the entire long one. Different data structures for different tasks! Anyways, bytestring and (especially) text are not part of GHC, and have their own issue trackers. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12248#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler