It is not speed, it is room to work. More of it will not make a machine faster; it lets you keep more things open before everything begins to crawl.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
counter space while you're cooking.
For example
You open twenty tabs and the computer slows to treacle. You close fifteen and it is quick again. Nothing was deleted — the desk was simply too full to work on.
This is one card out of 275.
The hundred words you meet most are free — the whole set, animated, in one file that works with no internet.
Volume 1 has all 275 in fifteen chapters, with Staying Safe the largest chapter on purpose.