Reply to OS X latency issues

So I finally got my hands on a new (to me) macbook. It's not brand new but should be able to handle Traktor scratch perfectly fine, but I seem to be having some latency issues no matter how I change the settings. What's weirder is that my desktop pc is much more responsive in Traktor even with a higher latency set. I have tried with both traktor 2.x and 1.x, at first I thought it might just be that the mac couldn't handle traktor 2.0 but even on the previous version with the latency set at 1ms I was getting a delay.

If anyone has any ideas id appreciate the help.

the machine is a 2009 macbook with a 2ghz dual core processor and 3gb of ram.