Sony VPCSA Series - Manual (Page 123)

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Customizing Your VAIO Computer >
Selecting Performance Modes
Selecting Performance Modes
Your computer is equipped with the performance selector switch for changing the performance mode without restarting the
computer. You can select either of the performance modes: STAMINA mode for lower power consumption or SPEED mode
for faster performance.
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While any software application that prevents your computer from changing the performance mode is in use, selecting another mode with the
performance selector switch may not change the performance mode. In such a case, close the application. The selected mode will automatically be
activated. Changing the performance mode without closing the application may cause loss of unsaved data.