See, this is an instance where logic would be useful to you. Nowhere did I say that you can IDENTIFY and SOLVE a problem using logic alone; I'm saying that you can use logic to ACKNOWLEDGE that there is a problem - ie: "OMG there is a big, red blotch on your face. Logic leads me to believe that it is not normal or conducive to your positive health. Better go see a qualified dermatologist." Or, to be more relevant to my point, "OMG, this game is performing at a much lower level than other similar games, and this poor performance occurs on many more machines than one would expect from professionally coded engine."