Importing class causes freeze

here's the code, on the swf's _root:
import com.website.package.Application;
//Application.Main( this, "Menu" );
even with the second line commented out, we get a big freeze,
whole seconds of wait. the movie just completely stops playing,
even an onEnterFrame method on the _root won't run until the import
is finished. just nothing but waiting for the code to import.
Application.as links off to an MVC architecture with a whole bunch
of additional classes etc. and the inclusion of this line is enough
to turn a 3K swf into a 443K swf.
erk! what can you do about that?!?!?
r

i'd love to. the problem is though that the movie itself has
frozen. i put a test preloader in that displays bytes loaded
alongside bytesto load. they sat and did nothing until the import
was finished, then both displayed 442K. so then i got rid of that
and put a simple 2 frame vibrating MC on their instead. it was
motionless until the import was finished
i can't emphasise this enough: it's not a big preload its the
fact that the movie won't run AT ALL until the import is done. its
a big problem.

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    case 3:
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