Quick tip for people struggling with pacing - have at least twice as much build up as there is payoff. So if your super cool dramatic moment is say, 3 pages maybe, you need to have at least 6 pages of buildup to it.
For example, imagine in a 3 panel gag comic.
Panel's 1-2 are usually set up, panel 3 is the punchline. There's twice as much buildup as there is payoff.
This is flexible though, say the big payoff moment is a huge twist and it completely changes the interpretation of the rest of your story, and that reveal happens on just one page. 2 pages of buildup probably wouldn't be enough for that now would it?
On the flipside lets say you're building up to an important character sequence where two side characters go on a first date or something, and you want to build up to their first kiss, the whole sequence is about 4 pages, 8 pages of buildup is probably too much, but maybe not, it's up to you.