6.1.. yes its horrible, however 6.5 isn't THAT bad(even for a beta).. there are some guys working on it @ XDA, im running it on a Mogul(titanium and animations disabled), and its no worse than 6.1 at the moment..
Which means it will surely surpass it by the time its device ready.
buuut if you're comparing it to the linux's of the world, then yes it's probably pretty bad.