It's been proven that adding more memory to a computer system increases its performance. If there isn't enough memory to hold all the information the processor needs, the computer has to set up what's known as a virtual memory file. In so doing, the processor reserves space on the hard disk to simulate additional RAM. This process, referred to as "swapping", slows the system down. In an average computer, it takes the processor approximately 200ns (nanoseconds) to access RAM compared to 12 million nanoseconds to access the hard drive. To put this into perspective, this is equivalent to what's normally a 3 1/2 minute task taking 4 1/2 months to complete!
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