Ancestry just released their newest version of their mobile application.
Well testing was brief and then interrupted by Ancestry not being available (to the app; Ancestry.com was ok via the laptop).
The interface was lovely, but the constant tinkering with the interface is confusing the end users (at least this end user, who is a professional IT worker) and not intuitive at all.
The speed I could not test with my small tree. But it will reload your tree data from the website, so something in the data / model must have changed for the app.
More to come when the App can reach the website .. reliably.