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Haskell Performance Resource

Data Types - Functions
Overloading - FFI - Arrays
Strings - Integers - I/O
Floating point - Concurrency
Modules - Monads

Strictness - Laziness
Avoiding space leaks
Accumulating parameter

GHC - nhc98 - Hugs
Yhc - JHC


Int (the machine word-sized integer type) is faster than the arbitrary precision Integer type. So don't use Integer in critical places, like inner loops.

That being said, the Haskell (or at least GHC's) implementation of Integer is very fast, as far as arbitrary precision arithmetic goes.