We used a time-sharing method for virtualizing the CPU where only one process runs at a time (on a uniprocessor), so why don't we use a time-sharing model for virtualizing memory where only one process is in physical memory at a time?

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Horrible performance: While saving and restoring register-level state (the PC, general-purpose registers, etc.) is relatively fast, saving the entire contents of memory to disk is brutally non-performant

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Disk space would fill up too quickly if it is required to store the memory for all processes except the one currently running.

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Each process would then have access to too much memory (consider the size of address space to the size of physical memory).

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Time-sharing and space-sharing methods are equivalent because of the physical laws behind the spacetime continuum.

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We used a time-sharing method for virtualizing the CPU where only one process ru...

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