PowerBook Performance for Java Development?

brasten wants to get to the core of this issue: "I'm in the market for a new development notebook. I would like to jump into the Apple world and pick up a PowerBook. However, compiling very large Java applications of course takes some time, and so raw processing speed is a factor. I have been unable to find solid data on how fast a 1.33GHz PowerBook runs against the modern x86-based notebooks. Does anybody have any information that could help me compare?"