Hello.
MacOSX(10.3.9) as well as MacOSX Tiger on my IBook (Dual USB) G3/600 Mhz started to run the processor only at low performance (400 Mhz). Energy behavior is set to maximum processor power.
Only MacOS 9.2.2 runs at normal speed (600 Mhz). Here I can switch between 600 Mhz and 400 Mhz...