Preloader too slow?

1

Just made a basic preloader, using action script to move the playhead along the timeline of an mc until it reaches the end (last frame being 100% loaded). However: the playhead on the root timeline already skips to the next frame of the website before the complete preloader animation has run! When ca. 85-90 % is loaded, the playhead already continues to the rest, the preloader is never fully played. What can be done?

This is the script I used:

First frame on the root:

stop();

onEnterFrame = function(){

var percent_loaded = _root.getBytesLoaded()/_root.getBytesTotal();
preloader_mc.value = percent_loaded;

if (percent_loaded == 1){
    delete onEnterFrame;
    play();
}

}

On the preloader mc:

var value = 0;

onEnterFrame = function(){
var frame = 1 + Math.round((animation_mc._totalframes - 1) * value);
animation_mc.gotoAndStop(frame);
}

onEnterFrame();