Pb 800mhz And Tiger Fan's On Always


My daughter installed Tiger on her 800Mhz 15" Powerbook
with 1G RAM. Dashboard widgets seemed to slow down the
machine, so she removed most of them. But upon installation
of Tiger, the fan is on constantly.

Is Tiger that much more consumptive of resources -- disk
activity, etc. -- or is it just set to a lower temperature
threshold for the machine?

Can this be fixed? Perhaps with a different energy setting?
The machine's clean, and nothing else has been changed
since upgrading from Panther.

Anyone else see this happen?