This typically helpful post by patter suggests three ways to speed write – it suggests that the relationship between speed and slowness in academia isn’t necessarily zero sum. Slow planning can facilitate fast writing:
The usual way to write fast is to ‘speed write’. This often requires the use of timed sessions where the goal is to write as much as possible in the allotted minutes. Another approach to producing a fast first draft is to just literally empty your thoughts onto the page – sometimes referred to as vomiting words, a term I don’t much like for obvious reasons. Barbara and I are using a third approach – fast writing on the basis of a slow-cooked plan and a lot of pre-preparation. […]
The plan we have for our chapters might seem to someone else to just be a relatively short, numbered bullet point list. Two mere pages of bullet points. However, the bullets must be understood as a set of reminders of the very lengthy conversations we’ve already had about what is to be covered and what should go where. Our two pages are the framework that now guides what we do. While we might change the order of a few points, or add, remove or shift the odd one here or there, this numbered list is basically a road map to our book.