Performance - yes. The license for Developer Edition precludes you from using it in a production environment however. If you get tagged for an audit, you're up a certain creek without a paddle.
I'm going to quote myself in a reply to someone else recently, because this is relevant here as well:
Bit of advice : your questions show a
lot of "beginner" traits. That's not a
bad thing, and I'm not trying to
discourage you from asking questions
here. However, you might do well to
find a qualified or experienced
person, either physically near you, or
online, that you could engage in a
real dialog about what you need for
this project. This site is
specifically for targeted questions
and answers, and I think you would
benefit a lot more from an "overview"
type of conversation instead.
In your specific case, you may want to hire a consultant, because this sounds like a potentially commercial operation and you may need a professional to help you. Try to structure the engagement as a knowledge transfer, so you can get to that level someday yourself.