gzip works by constructing, on the fly, a dictionary of strings it has seen before and sort of inserting them by reference. When you see something red and in b

gzip works by constructing, on the fly, a dictionary of strings it has seen before and sort of inserting them by reference. When you see something red and in braces, that is a bit that has occurred before and been inserted by reference. I'm guessing that it is happening at a constant symbol rate, you'll notice it speeding up as it includes more and more text by reference instead of a single character at a time.