Usually what happens at this point is that I revise my outline, because the scene-by-scene breakdown won't be quite right. I'll have understated the importance of some elements and overstated others. Especially at the end of a novel, the balance between elements -- otherwise known as pacing, and it's not a magic word but a structural and technical trick -- is crucial if you don't want to lose your reader.
Subplots, I'm talkin' to you.
It's the third act, okay? People don't care about you... well, they do, but what they really want to read about at the climax is the main characters. The romance. How they get the bad guys.
How subplots wrap up is secondary. That's why they're called subplots.
But without them, the main action won't make sense. Characters discover things and decide things. The scenes need to be there. Unless I want to cut those secondary characters altogether, and restructure, and, y'know. Rewrite the whole frickin' book.
So I'm keeping the subplot scenes short and to the point. Giving them the most gripping hooks at start and finish as I can. And interweaving them with the main action. Short scenes add to the illusion of pace, too, but for pulse-pounding excitement, you can't go past the old trick of actually having something happen. Ahem. I could point the finger at certain UF and romance series, but that'd be childish...
So as a reader, how do you like your endings? Do you want the bad dude defeated, the romance resolved and boom, that's the end? Or do you like more of a slow let-down after the climax, with more happy-ever-after epilogue scenes? Or (shudder) do you adore the cliffhanger?