I'm doing some work here (email in Mozilla, reading some web content) and the system is just dogging it, I'm typing ahead of the responses which is really irritating. It turns out that I've got a unix job (on another computer) spewing out lots of exception messages into a Terminal.app window, and that's sucking up like 40% of the CPU.
The lesson here is that reasonably advanced User Interface facilities are unequaled as profligate burners of CPU, and probably always will be.
