You can make a splash screen for your application, with a small amount of code that uses VI Server to open a VI reference to the main VI of your program. This should load the entire hierarchy without showing LabVIEW's 'Loading' screen, unless it has trouble finding a subVI (shouldn't be an issue if they're all in the EXE) or a DLL.
For more information, see http://messages.info-labview.org/2002/02/13/29.html.