Chapter 4 gets revised in one long session, punctuated by breaks to get more coffee. Much of the chapter was all right before, but the context has changed, and the matter of what information needs to go where dictates which conversations stay. I chop off a section at the end as well, bringing the chapter back to a reasonable size. A similar scene will show up a few chapters later, anyway.
The beginning of Chapter 5 is also something that gets adjusted, although the rest of it will need to be composed anew. Still, it feels good to be a little farther along than I was, and I like being able to say that I fixed more than one chapter today.