I recently bought my Powerbook 17 inches 1.67 Ghz, at the Apple Store in The Grove. I am very happy with it. But I have noticed that it is kind of slow. In example, if I preview an iMovie, the image will hesitate for a split second couple of times, and the same is true for iTunes as I turn on the full screen visualizations, those will not display smoothly, but will eventually kind of freeze for a split second and then continue. Are Powerbooks really that slow? Yesterday, I finally was able to buy 1 GB RAM (Kingston). I installed it yesterday and now it has 1.5 GB of RAM. I was disappointed to see that the RAM was recognized by my laptop, but there is no visible improvement, the screen keeps on hesitating and freezing and takes the same time to open iPhoto libraries, etc Is this an isolated problem? Or are all Powerbooks the same? Thanks!