I’m guessing you’re on a Mac, since what you’re describing sounds like Exposé behavior (the Shift key makes it go in slo-mo). Go into your System Preferences, select Keyboard & Mouse, and under the Keyboard tab, make sure the checkbox that reads “Use all F1, F2, etc. keys as standard function keys” is selected. Then click Show All to return to System Preferences, go into Exposé and Spaces, and set Show Desktop to something other than F11. That should do the trick.