I just write.
It's just me and the creative process--which I love.
It's also something that I've learned over time. Four years ago, I stated, very clearly that I would never be able to write over 2K words a day and I couldn't. It was a struggle for me to get that much even over a week. This past Saturday, I wrote 8K words in an afternoon--big evolution. Is this always my output--no. I don't expect myself to because it seems like an unrealistic goal for me personally. I do like to get around 2K words a day, but that doesn't always happen either.
A lot of fast drafting, for me, is simply getting my thoughts out on 'paper'. It clears the way for more information that I can get down on the same book, especially since I typically write shorter stories (my shortest published work to date is just a bit under 50K words).
I like to call it dumping my brain. LOL
Anyone have any other methods they swear by that they care to share?