More impressive in the same book, how another server (Warp) written in Haskell (GCed lazy functional language, supposedly way slower than C over epoll) achieves

More impressive in the same book, how another server (Warp) written in Haskell (GCed lazy functional language, supposedly way slower than C over epoll) achieves the same performance as nginx! http://www.aosabook.org/en/posa/warp.html http://www.aosabook.org/en/posa/warp.html