Mostly, when I think of pacing, I go back to Elmore Leonard, who explained it so perfectly by saying he just left out the boring parts. This suggests cutting to speed the pace, and that’s what most of us end up having to do (kill your darlings, kill your darlings, even when it breaks your egocentric little scribbler’s heart, kill your darlings).

Stephen King (b. 1947) American author
On Writing, ch. 12 (2000)
    (Source)

See Leonard and Quiller-Couch.