I meant that I hope you explain elsewhere in the book why these notions are related. Too often in physics people just accept how things work out without understanding why mathematically. For instance, the whole point of introducing limits is to make the "obvious/graphical" answer of "download speed" rigorous, but students rarely make that connection regardless of how many times the professor or textbook reiterates it (most likely because they don't read the textbook or go to class to begin with).

Do you in your book mention that calculating the exact download speed is impossible (and why this is the case)? Do you mention that the download speed one sees in their web browser is an approximation via a limit? These are the kind of important connections that get lost in the bullshit and the calculations.