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In general, applications are I/O bound or processor bound, meaning that the process is waiting for either I/O or everything else is waiting for the processor to finish working.

With the speed of today's CPU's, most modern applications are NOT processor bound, meaning that we're typically not waiting for the processor to finish what it's doing. Usually we're waiting for some kind of I/O process to complete.

Many times we're I/O bound when we have insufficient memory and the operating system has to "swap" an application or parts of an application out to swap space (virtual memory) on the disk. Moving an application into and out of virtual memory becomes very time consuming and is often the reason people are advised to add more Random Access Memory (RAM) to make the computer run faster.

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