Fast out of the gate

On May 20, 2012, Jillian wrote, I always like stories that aren't slow and get going quickly. But now I look back at my story and am thinking, It's going too quickly. I have had my friends read it and they understand the beginning completely. I even have backstory in there but it's just very quick. Is there such a thing as too quick a beginning?

I wasn’t sure I understood, so I asked for clarification, and Jillian answered with this: Continuing my last comment, I guess it moves quickly in that...