Hi all, To demonstrate the bottlenecks of GHC, I have released "witty", a simple network server. If you specify command line options, "witty" uses ideas to overcome the bottlenecks. I hope we can use "witty" to convince ourselves of the problems and discuss how to fix them. You can install "witty" by % cabal update; cabal install witty For more information, please read: https://github.com/kazu-yamamoto/witty/blob/master/README.md --Kazu