I'm definitely a tortoise; I can't do the whole 'write the first draft quickly and badly and then go back and rewrite it, and then scrap the whole thing and rewrite it again before editing it' that seems to be the accepted wisdom. I didn't grow up writing that way, and I'm too old to change.

I only get one basic manuscript draft, and it has to be right in all but minor details before it can progress. Once it's done, it's supposed to be ready to go, subject to basic editing and rereading (e.g. rewording for clarity or to avoid phrases that sound clumsy, or have been echoed repeatedly).

But of late I can't claim that my slow progress has been due to finalising every paragraph as I go; it's just finding the whole process difficult and uninspiring. (And apparently I'm perfectly capable of rewriting *other* people's work, or coming up with demonstration pieces on the spur of the moment to illustrate a particular point, so it's not the ability but the enthusiasm that's lacking.)