Hi, Tom Preston-Werner here, one of the fuzed developers. Keep in mind that Scott is running Rails in development mode. We'll be doing more experiments with EC2 and production Rails to see what kind of numbers we can push with that setup, and also what kind of performance we can do for static assets. We'll put our results into the Readme once we have some solid, repeatable statistics for you.
No, Fuzed does nothing to help with database scaling. If you're going to scale big you'll need to deal with that separately. We hope that Fuzed will free up your time to deal with those interesting DB scaling issues!