I'm sure it'll be slower than Git--literally ever DVCS I know of is, because Linus, as a kernel hacker, built Git around things he knew would be very fast--but

I'm sure it'll be slower than Git--literally ever DVCS I know of is, because Linus, as a kernel hacker, built Git around things he knew would be very fast--but precisely for that reason, you can be tremendously slower than Git and still be extremely fast. Mercurial can fall into that category: merely starting Mercurial can take longer than some Git operations take to complete, but that ends up meaning that they take a whopping 150ms on the Mercurial side. Given people generally perceive operations that take less than 250ms as instantaneous, that pretty much literally doesn't matter. While I have no idea whether Veracity will get that close to Git's speed, there's no reason it can't be close if they've written it well.