No I dont think its slow at all, in what way is it slow? I feel like it responds similar to panda which responds like the stock home. The only problem I see with this is the way it chops the wallpaper together in the last screen (if you have the setting wallpaper scroll and workspace loop on).
I think this has potential and its still a beta.
If they could add the option to put messaging/browser/gmail on the dock that would be awesome. Those plus the phone and voice command is something I would like to have on every screen.