Preloader onsly starts at about 17%

hi,

i am using this code for a preloader:

[AS]bytes_loaded = Math.round(this.getBytesLoaded());
bytes_total = Math.round(this.getBytesTotal());
getPercent = bytes_loaded/bytes_total;
this.loadBar._height = getPercent300;
this.loadText = Math.round(getPercent
100)+"%";
if (bytes_loaded == bytes_total) {
this.gotoAndPlay(3);
}
[/AS]

Now the thing is that, when i test in using “simulate download”, i see it starting at 1% in the bandwidth profiler, going up nicely to 100%.
But in the movie i see nothing in the begining, and then suddenly, when the bandwidth profiler is at about 15%, the movie shows (and the loadbar is also already at 15%.

Any idea what’s wrong?