> Any idea how fast it is? GitHub have put a considerable amount of effort into a very fast implementation.

From my tests, is usable. I'm using in the intranet, and have an installation with 20 users and 15 repos so far, with ~100MB each at the moment.

However, this project is not targeted as a GitHub replacement (massive hosting with many huge repositories), but toward small teams that need a UI and simple admin for their Git repos and aren't allowed (or don't want) to use an existing cloud service, or don't have the budget for the GitHub Enterprise.