Lag!

Im working on a layout for my site, and I used kirupa’s snow 3.0 script,
the snow seems to lag quite a bit, you can see it here:
http://www.astral-lullaby.net/testyyyyyy.html

I edited the script a tad bit as I wanted the snow to fall quicker,here it is:

init = function () {
    width = 300;
    // pixels 
    height = 200;
    // pixels 
    max_snowsize = 10;
    // pixels 
    snowflakes = 30;
    // quantity 
    for (i=0; i<snowflakes; i++) {
        t = attachMovie("snow", "snow"+i, i);
        t._alpha = 20+Math.random()*60;
        t._x = -(width/2)+Math.random()*(1.5*width);
        t._y = -(height/2)+Math.random()*(1.5*height);
        t._xscale = t._yscale=50+Math.random()*(max_snowsize*10);
        t.k = 1+Math.random()*5;
        t.wind = -1.5+Math.random()*(1.4*5);
        t.onEnterFrame = mover;
    }
};
mover = function() {
    this._y += this.k;
    this._x += this.wind;
    if (this._y>height+10) {
        this._y = -20;
    }
    if (this._x>width+20) {
        this._x = -(width/2)+Math.random()*(1.5*width);
        this._y = -20;
    } else if (this._x<-20) {
        this._x = -(width/2)+Math.random()*(1.5*width);
        this._y = -20;
    }
}
init();

What can I do?