Powerbook Cpu Performance Problem?, unusual CPU usage Options

[earthlinger]

hi everyone,

I just bought Powerbook 15 1.67 with 2 gb ram and 100 gb 7200 rpm hard disk. I made a simple performance test in my laptop to compare it with my PC DAW. I opened one of my heavy projects in Reason. On powebook cpu meter in Reason is half full in the beginning and when it comes to heavy parts in the song it reaches to 90 percent. Also sometimes you can hear clicks and slowing in tempo. In my Daw same project max peak is around 40-50 percent at CPU meter in Reason. Powerbook uses built-in audio. My DAW uses Yamaha 01x. I'm not sure if the reason of poor performance is built-in audio. I am really worried about the performance. I was planning to use it in my live setup. I'm also planning to buy new sound card for it. However nowadays I'm just making performance tests in my laptop. My DAW has less RAM (1 GB) than powerbook. I will appreciate if anybody have any advice for me?

earth linger