First I want to mention, that i'm a real wp7 lover. Everywhere I read how smooth the OS is. Of course, the built in applications (eg. facebook, contacts, ...) are really smooth (I think they are not fully coded in .NET). Today I looked for a offline map app both on wp7 (Samsung Omnia 7) and on my girlfriend's Android (Samsung Galaxy S, 2.3.3). In every 3th party map app (eg. "Offline Maps", Gps Tuner "Navigation", etc) the map dragging is not very smooth - on android it is much better. Also page transitions in wp7 within an app take much more time than in a similar app on android. Do you have the same opinion? Do you think it would be better in the mango release - the same as the android 2.1 -> 2.3 boost? Can someone compare the app startup times between an iphone and wp7 device (for example the Facebook or twitter app, not preloaded of course)?