Any suggestions on how this might be improved?
Anyone have any info on this? I'm wondering the same thing, as it's definitely one of those things that makes the app seem less-than-native. Also I notice that it doesn't occur in the simulator, only on the device (I assume because the PC is so much faster at creating the window).
What is slow? the transition or populating the window?
Includes are slow, even is not an official fact, I can tell you that includes are slowing down the load of a window/app. Try to defer the stuff you don't need in the UI construction as much as possible.
Another way would be to make all one_file_app, but it's painful to maintain :)