Keep in mind though, access time for hard drives is orders of magnitude slower than access time for ram. I'm not totally up to date on what hard drives do right now, but a couple of years ago it was something like 50-70 thousandths of a second. Access in RAM on the other hand is a few nanoseconds, billionths. The moral is, doing things in ram is not slow, it's the hard drives that are slowing you down.
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