There is no “too fast”. Write at the pace the story comes to you. If you sit on a story too long, you never finish. Write it out, even if you have one chapter that has a single sentence in it that says “something needs to go here”. Write the entire thing out from end to end. Revisions exist for a reason. I’m starting to realize that there are TWO huge hurdles for writers. One is shutting up about writing and just writing…finish something. The other is to actually have the discipline to go back and rework/revise and edit.

Don’t let some misguided concept that there is a correct pace to write stop you from getting the story out while you still have a passion for it. Editing is the passionless part (for me) that requires a critical eye more than heart. So embrace the passion, burn away….and then let the cold, critical eye of your internal editor at the finished work to start polishing it.

Check out Zabe’s blog: http://zabe.net/

You might also try doing some writing exercises outside of your story (short stories or flash stories) to try to build at least a familiarity with slower pace. I assume you know what it is, but writing it out is another thing. Maybe you can write the back story of a character, or a purely descriptive setting you want in your story that includes no people or nameless people.

I hope at least one of those suggestions help. >.>