As a naive benchmark I packaged Millstone UI Library sources together with Apache Ant and a simple test-script to recompile Millstone with Ant. Even though this benchmark is naive, I think it gives a pretty good picture of the performance from a developer point of view. The most interesting founding is that Pentium-M based notebook seems to be twice as fast as PowerBook - clock for clock. The situation is even worse because one can currently get 2.0Ghz Pentium-M notebook, while the fastest PowerBook is equipped with 1.67Ghz G4. Please tell me that I am wrong! More details can be found here. You can test it yourself by using my simple benchmark. There is already 16 different machines tested including PC:s and Macs. Two examples: Thinkpad T42 1.6Ghz does the compilation in 13 secs, while my 1.5Ghz PowerBook G4 uses 27 secs.