Read it. Honestly the paper is mostly a critique of functional programmers resting on their laurels for too long. "Hey guys, our tail-recursive fib is just as

Read it. Honestly the paper is mostly a critique of functional programmers resting on their laurels for too long. "Hey guys, our tail-recursive fib is just as fast as a for loop in C" "Yeah that is pretty cool. But uh, we're simulating millions of particles in huge blocks of contiguous memory using C++. Your cons cells are too slow for that." "Optimizing iteration over our list data structure? Uh ... catch you later." Anyways good read and it's great that Haskell continues to take performance very seriously without abandoning expressive capability.