Last comment on this thread was made in March 2014 but it seems the issue mentioned is still there.
I am also facing this sluggish scrolling and animation on my android device + Genymotion too. I am using Android 4.1.1. Using latest ionic and cordova to build app.
In my app, I am using side-menus, lists and cards within tabs, modal (slide up) on click of a button and all of these have interaction issues.
I will soon share the demo app code with these performance issues for Ionic team to work on it. These performance issues are show stoppers for Ionic to get accepted among Android app developers. Sorry to say, with such sluggish scroll and animations, no one will build production level Android apps using Ionic. I think these issues are not there on iOS and are limited to Android. Quick fix to these issues will help lot many Android developers (including me) who want Ionic be the de-facto framework for building hybrid apps.