I'm really slow, too, but it's due to procrastination and other hobbies.
Heck, the fact that I can (mostly) keep up during NaNoWriMo makes me want to write my short stories more often. If I can bang out a 50,000-word novel in 30 days, I should be able to carefully write a 3,000- or 5,000-word short story in the same amount of time - instead of taking the better part of a year to get a new "Vampire Killer" or "Blackjack Jill" tale up.
Sometimes it's straight dialogue with almost no description.
That's what a lot of my novel is like so far: lots of dialogue where my MCs talk about themselves and their respective worlds. Actions are at a minimum, and I have yet to write physical descriptions of my characters.
The quality of my prose is definitely suffering for the speed this year, but I wanted the experience of writing at least one novel where I was hopped up on energy drinks and no sleep and I didn't care and I didn't know what I was doing or where the novel was going, and I just wanted to poop out as many words as possible. I have no idea if the resulting novel is even going to be worth saving, but the experience has been worth it, all on its own.
Yeah, I've never done anything like this before either. This will end up being the largest single story that I've ever written (excluding a 50-"episode" Gundam fanfic series that I did back in 2007-2008 that relied on way too much copy-paste of whole scenes with only the character names and small details changed).
No energy drinks / lack of sleep, though, because Mom wants me off the comp by midnight (and I'm 36 years old!).
ETA: Do give you an idea of my gleeful lack of artistic integrity: Most of those 2k word half hours have been either gratuitous violence or gratuitous sex that I put in because I needed words and I didn't know what to do with the story yet.
Haha, lots of gratuitous sex between my two MCs, too. Also, lots of silly, drunken dialogue while they're getting wasted ("Behold my hoo-hoo!" "Grow a lady-penis right fucking now!" "I fucking declare us to be the Queens of Awesome! Mount your steed, my lady!"). And they're 13 years old.
Yeah.
If this is ever turned into a movie (ha!), there's no way that it could legally be filmed as is.
Heck, I might have to bump them up to the magical arbitrary age of 18 (which would mean moving this down to a few years in the future, since I want them to be conceived in the 21st century) to even self-publish this; I'm not sure.