[citation][nom]tanjo[/nom].@mihaimm: But don't they(iOS users) usually use site specific apps for access?[/citation]
If it's an HTML5 based app, that's gonna use the same Safari browser. More and more apps become HTML5 today as it makes little sense to develop completely different ones for Android, iOS, BBOS, bada, WM, webOS and Symbian. Instead we're using the underlying browser and the HTML5 capabilities to develop stuff that works reasonably well an all platforms and then we optimize for each in particular. But at least there's a common code base that can be reused. As such, the performance of the browser is crucial for the performance of the application.