Different processors are good at different things. Take a look at the Tom's CPU charts under Whetstone and Dhrystone. My guess is that the process you are complaining about requires the kind of opps that Intel chips are better at.
Edit: This probably means that recompiling won't help. You can't just change what type of operation is required to perform a calculation. An example: Say you really like adding. Not only do you like adding, you're good at it. You're not good at square roots (then again who can do these w/o a calculator these days anyway). You couldn't change the square root problem into an adding problem to make your life easier. If I'm wrong about this someone tell me how and I'll love you forever... maybe not forever... maybe not even STRONGLY like you... oh well, you get the idea.
-mcg