Black screen for more than 3 sec without loading indicator appears after splash screen

I am working on Roku app using Scene Graph component. In my application when i launch application then showing black screen on few seconds between the splash screen to
the main screen but i want showing loader in between screen. it is possible in Scene Graph? Please provide suggestion to resolve it.

Why is it showing black screen for so long - is it compilation or runtime delay? Should be easy to tell if exiting the app and starting it again is much faster the 2nd time.

If creation of RSG components is slowing the display, a workaround is to use non-RSG screen to display the loading msg