Dear Haskellers, I've released a package to address the topic raised by Simon in this thread: http://www.mail-archive.com/haskell-cafe@haskell.org/msg83901.html I am pleased to announce that it generates random numbers as fast as System.Random.StdGen but with better statistical properties when generators are split. When newer hardware supporting AESNI is available, it will run an additional 2X faster. You can find it here: http://hackage.haskell.org/package/intel-aes https://github.com/rrnewton/intel-aes/wiki This release is non-portable (linux 64-bit only). I'm looking for intrepid Windows hackers to help me get it running on Windows. The underlying Intel AESNI Sample library comes with a .bat, but I haven't got it working yet. Likewise someone who knows how to port assembly to Mac OS... Cheers, -Ryan