It’s common practice to implement an extended splash screen when your Windows Store app has a long or unpredictable start-up time, because it’s loading data off the web for instance. About 99% of the extended splash screens I’ve seen so far implement a page that looks like the default splash screen with the addition of a ProgressRing control to indicate it’s loading data.In this post I’d like to explain how to implement an extended splash screen that’s a bit more visually appealing and will transition into the main app experience without the jarring page navigation. My solution will be based off the excellent content available in the “How to extend the splash screen” MSDN article and accompanying Splash screen sample. The solution presented here is written in C#/XAML, but the same techniques can be applied to a JavaScript/HTML based app.

via Creating a smooth extended splash screen experience.