Fascinating, enlightening, extremely useful (memory speeds have not kept up with progress in raw computing power in modern computers see, beware of cpu stalling!). Expect it to take a couple of weeks to get through it and really digest all of it, it's a self-contained mini-course in electrical engineering...
here is a diagram comparing memory access speed vs cpu speed evolution - notice the growing gap.
from another excellent read showing how proper memory access can dramatically speed up your program.
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