preloading issue

my preloader works fine for small files, but for big ones, it doesnt show up until its already preloaded 80% of the movie, leaving just a blank screen until then.


scene 1 frame 1:


total_bytes = _root.getBytesTotal();
loaded_bytes = _root.getBytesLoaded();
remaining_bytes = total_bytes-loaded_bytes;
percent_done = int((loaded_bytes/total_bytes)*100);
bar.gotoAndStop(percent_done);
ifFrameLoaded ("Scene 2", 30) {
gotoAndPlay("Scene 2", 1);
}


scene 1 frame 2:

gotoAndPlay(1);


scene 2 is the large flash movie.

How do i make the preloader appear from the outset?