I couldn't find an edit button so I'm replying instead.
I've tested my game on my wife's Galaxy S2 and it displays very close to what the windows runtime displays, I also forgot to mention that my phone in a Galaxy S4 and I've also found performance is far better on the S2 than the S4 which totally baffled me.
Screenshot below is from the S2.
Android Version: 4.1.2
Build Number: XWMS3 NeatROM v6.4
Android Version: 5.0.1
Build Number: LRX22C I9505XXUHOD7
Any advice into performance issues and Edit Box issues would greatly be appreciated.
I have thoughts it's due to differences in the versions of Android.
I've had trouble with editbox text sizing too, and what fixed it was downloading the latest nightly build from the owner's lounge. I'm pretty sure that last update also has some fixes on performance issues. Maybe that could solve your problem as well?
Didn't know about nightly builds, will give it a try.