@Divoret Ah, a bit of both. The easy answer would be one by one, but it's a little more complicated than that :-)
1. It's an ongoing story, so I have a full plot, but not all the details. In other words, I roughly know where I go, but I wing it on the way.
2. I write in batches, and edit in batches. These sometimes overlap, so I may go back to change something in a previous chapter, if that works better for the story. (Which is where the 'DRAFT' chapters come from.)
3. Typically, I write in batches, so sometimes I post 2 to 5 chapters quickly one after another, and sometimes it takes me days...
Typcially, once a week (if real life doesn't interfere too much) you'll find me converting one to two 'DRAFT' chapters to 'regular' chapters.