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Thief Too-Much-WIP is stealing time from you when: Context switching is common: When computers context switch, the state of the process currently being executed is saved so that when it is rescheduled, the state can be restored to its correct spot. Because computers perform hundreds of context switches per second, it's easy to believe that multiple tasks are performed in parallel, when in reality the central processing unit (CPU) is actually alternating or rotating between tasks at high speed.