title: Python performance : Clang vs gcc
body: <p>I am observing around 20% performance difference with python compiled with clang (Clang 3.4.1 ) when compared to python compiled with gcc (GCC 4.6). </p>
  
  <p>I am using configuration script that comes with python. I am not sure if i am missing something on the optimisation of the clang complier. Please comment.</p>