Thanks to discovering a few programs that simply will not run on Panther, I'm thinking of upgrading to 10.4 Tiger. However, as things are right now, my 867MHz G4 PBook (with 640MB RAM) still fires up its fans fairly frequently when I'm running more than one or two medium-sized applications (Firefox, iTunes, etc.), downloading heavily from the 'net or other such things (and the fan is not quiet). So my concern is that Tiger will push my computer even harder (especially with Dashboard). Is this concern valid or am I worried over nothing?