Sorry if this is obvious, but when I do `brew install sassafras`, the bulk of the time between hitting enter and being able to run sassafras is downloading and

Sorry if this is obvious, but when I do `brew install sassafras`, the bulk of the time between hitting enter and being able to run sassafras is downloading and installing. The overhead of Homebrew seems very minimal. Is the slowness coming from a side of Homebrew that maybe I don't see very often?