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When a context switch in processes occurs, the kernel saves the context
of the old process in its PCB and loads the saved context of the new process
scheduled to run. Context-switch time is pure overhead, because the system
does no useful work while switching.

Allocating memory and resources for process creation is costly.
Because threads share the resources of the process to which they belong,
it is more economical to create and context-switch threads.
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