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Some applications aren't ended completely when you return to the home screen. If you don't end them from the list of running applications, they keep running in the background which may slow down your tablet.
1. End running applications
Slide your finger slowly upwards starting from the bottom of the screen until the list of running applications is displayed.
Slide upwards on the required application to end it.
2. Return to the home screen
Press the Home key to return to the home screen.