Performance difference WP8 and Android - Even in a very simple 2D game

So I have this fun game Bubbara which is unfortunately not making millions of downloads for me. Well the problem is that I have published this game on both Android and Windows Phone 8 . And the Windows Phone 8 version is surprisingly butter smooth on Lumia 520 and the Android version is noticeably laggy on comparable mobile phone. I am aware of the Android's fragmentation might be an issue but given the simplicity game this must not have been a reason for bad performance on Android . I am using Unity 4.3.1 ... Is there a performance fix for Android devices ? Note I have already disabled VSYNC !!! Bubbara Windows Phone 8

Bubbara Android