Panther IS in fact faster than Jaguar, there are some benchmarks floating around to confirm this but i'm too lazy to go find them now. One thing that Panther currently is PAINFULLY slow at, is fading effects. The new system preferences has a neat fading effect which slows it down really badly. Fortunately you can use the Jaguar System Preferences App (which has all the correct Preference panes but in the wrong places)
A neat note about Exposé as well, you can set any button on your mouse to do any of the three tasks, a cool way to utilize this is to hold the button down, then hover over the window you want then let go. This is much faster than pressing the button, going to the window and clicking on it as it requires less finger movement.