This Friday adobe released the first beta of Phosothop. The best news for us Mac users is that it is now unibin. Here is the difference:
Radial Blur with 100 on Best and spin

Using this image:
http://joro.geodar.com/images/ps3.jpg
Photoshop CS2: 103 seconds
Photoshop CS3: 70 seconds
MacBook 2.0GBz white, 1.25GB ram, 100GB hdd 5400rpm