I don't get the 80% CPU Usage thing either.

When I render any of the files I've created, I get a full 100%, so there's something going on with the test file that is causing my system to behave differently than normal.

I've also got a disadvantage with the XEON processor, in that my FSB is only 500Mhz and my RAM Bus is 333Mhz. Those are both slower than is available with the straight P4 processor.

I'll be happy with my 46 seconds for now...