[iPhone] How to boost start up performance?

When my view based app starts, once the screen turns black
then after a short while, view componets are displayed.
But when pre-installed apps start, the screen immediately
displays navigation bar and background.
How can I start app fast like pre-installed apps?

Thank you very much Jan Frydendal and sptrakesh, I didn't know the technique.
By including Default.png, the impression of the start up time was quite improved.
And I would like to know the details about "loading view in chunks".
My app creates subviews in viewDidLoad method now, but is there better way?
Also I would like to know how to load data lazily.
I am afraid the start up time will be slower if the size of the app data increases.

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