I've worked on both RoboVM and Mono, I can tell you first hand that these are issues that are real and have high impact on performance. Android and Windows Pho

I've worked on both RoboVM and Mono, I can tell you first hand that these are issues that are real and have high impact on performance. Android and Windows Phone don't lock their respective managed runtimes down like Apple does lock down the likes of Mono/Xamarin. On Android you have full access to almost everything, and on Windows Phone MS has a vested interest in exposing all required features to their managed runtime. No such luck on Apple hardware.