You can select whether to use transitions - the animation that is shown when you change desktop - and which type and the speed they go in the Transitions preferences.
Some people prefer to turn the transitions off altogether, and this provides the fastest possible way of changing desktops.
If you like the transitions (and I do), I recommend you use Slide or Cube transitions. But the Reveal, Fade, Flip and Inside cube settings are fun too - try them out!
The transitions will reinforce the impression that your desktops are in a grid, and help you to remember where each application is.
The Slide transition is slightly faster than the others to activate, so if you want things to be super snappy, try Slide. Also see the FAQ where there is some additional information about transition animations.
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