Personally, I have never tried to write a book fast. I've found many benefits to writing slow as well—such as having time to brainstorm, coming up with new plot elements, and not becoming burned-out from writing so much. Usually, when I do go through a period of time when I am able to get a lot of writing done, I feel drained afterwards. I am often left with no inspiration to work on the story for a while. And while it is important that writers learn how to write even when the inspiration is not there, I have found that I can think a lot more clearly when I take my time on a story. However, I hope to—some day—become one of those authors who is able to write multiple books in one year.
What about you? Do you write fast or slow? Do you think one is more beneficial than the other?