I'm running 12Beta2 on my 5S. I'd say performance is better than iOS11 at this point. There's still a lot of rough edges and I suspect they have a debug build

I'm running 12Beta2 on my 5S. I'd say performance is better than iOS11 at this point. There's still a lot of rough edges and I suspect they have a debug build released at this point. I think the final build will be really good.