I wish I could bang out a first draft and let stuff flow and then go back and revise. I seem incapable of it though. I've never been able to really turn off the internal editor enough to do this, although I am jealous of those who can. It's like I lurch forward for a page or so and then have to go back and mess with stuff, lurch forward another two pages, go back and pick at all three... etc... I think this is probably why I'm on the slower end of writers.

It's actually hard for me to tell how much I cut, because most of the time I'm doing it as I go along, but I'm guessing that it's probably a good 30% of what I write before I even get to the end of the first draft. After that it just depends. Like the one time I sent a fic to one of my betas and she cut out huge chunks of the dialogue - but she was totally right in that instance and the fic was so much better without all of that extra junk.