title: Double-precision operations: 32-bit vs 64-bit machines
body: <p>Why don't we see twice better performance when executing a 64-bit operations (e.g. double precision operation) on a 64-bit machine, compared to executing on a 32-bit machine?</p>
  <p>In a 32-bit machine, don't we need to fetch from memory twice as much? More importantly, don't we need twice as much cycles to execute a 64-bit operation?</p>