[eliasdejong]

Imagine if you measured the speed of beer delivery by the rate at which beer cans can be packed/unpacked from truck pallets. But then somebody shows up with a tanker truck and starts pumping beer directly in and out. You might argue this is 'unfair' because the tanker is not doing any packing or unpacking. But then you realize it was never about packing speed in the first place. It was about delivering beer.

[StilesCrisis]

This is actually a good analogy; the beer cans are self-contained and ready for the customer with zero extra work. The beer delivered by the tanker still needs to be poured into individual glasses by the bartender, which is slow and tedious.

[cake-rusk]

He probably meant beer kegs. Memory map-able data is closer to sending beer cans since both are in a ready to use format.