Slow Sprites

Continued from: " Cannot embed multiple swfs using swfObject 2"
The site referenced is @ http://www.l4dt.com/

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If you go to http://www.l4dt.com/ you'll see the "boomer" swf to the right. As more green sprites emerge from his mouth. Both the header rotating swf and the boomer swf slow. Why is this?

The sprites start fine, then as more occupy the screen at one shared time, everything gets slow, but there aren't even that many sprites!! lol. You'll see.

Is a possible solution to export this animation to After Effects and render it multiple times in the name of compression?

I figured this is how Adobe gets their big show off animations to run so smoothly, regardless there is surly a way to get my swfs running smoothly.

The boomer is constructed from three files:

Boomer.fla - http://www.l4dt.com/boomer.fla

Bommer.fla's document class, PxlFountain.as(courtesy of http://www.pxl.dk/flash/004.php) - http://www.l4dt.com/PxlFountain.as

GlowParticle.as - http://www.l4dt.com/GlowParticle.as

Boomer.fla bares no actionscript, although I need to know how to position him above the spawning sprites(something I'll need to know for the Poster App as well).

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PxlFountain.as:
package {
import flash.display.Sprite;
import flash.display.MovieClip;
import flash.utils.Timer;
import flash.events.TimerEvent;
import GlowParticle;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import boomer;


public class PxlFountain extends Sprite {

//Properties
private var _fountainTimer:Timer;
private var _timerInterval:Number;
private var _particleVelocity:Number;

//Constructor
public function PxlFountain(timerInt:Number = 150, particleVel:Number = -2) {

//Set stage
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;

//Set properties
_timerInterval = timerInt;
_particleVelocity = particleVel;

//Create timer
_fountainTimer = new Timer(_timerInterval, 80);
_fountainTimer.addEventListener(TimerEvent.TIMER, spawnParticle);
_fountainTimer.start();

}

//Create a new glow particle with random velocity
private function spawnParticle(event:TimerEvent):void {

var randomParticleVelocity:Number = (_particleVelocity * Math.random()) -2;
var particle:GlowParticle = new GlowParticle(randomParticleVelocity);
addChild(particle);
}
}
}

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GlowParticle.as:
package
{
import flash.display.Sprite;
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.display.Shape;
import flash.filters.GlowFilter;

public class GlowParticle extends Sprite {

//Properties
private var _particle:Shape;
private var _particleTimer:Timer;
private var _particleVelocity:Number;
private var _particleLifespan:Number;
private var _xPos:Number;
private var _yPos:Number;
private var _radius:Number;
private var _gravity:Number;
private var _vx:Number;
private var _vy:Number;


//Constructor
public function GlowParticle(particleVel:Number) {

//Set properties
_particle = new Shape();
_particleVelocity = particleVel;
_particleLifespan = 0;
_radius = 10 * Math.random();
_gravity = .7;
_xPos = 860;
_yPos = 60;
_vx = (Math.random() * 2 -2.4)*9;
_vy = particleVel;

//Set timer for movement and lifespan count
_particleTimer = new Timer(30);
_particleTimer.addEventListener(TimerEvent.TIMER, moveParticle);
_particleTimer.start();

}

//Calculate vectors, set new position and call draw method. Or respawn particle.
private function moveParticle(event:TimerEvent):void {
if(_particleLifespan < 300) {

_vy += _gravity;
_yPos += _vy;
_xPos += _vx;
_particleLifespan++;
drawParticle();

}
else{
respawnParticle();
}
}

//Draw the particle and set filter
private function drawParticle():void {

_particle.graphics.clear();
_particle.graphics.lineStyle(4, 0x455b00, 1);
_particle.graphics.drawCircle(_xPos,_yPos,_radius);
_particle.filters = [new GlowFilter(0x5d7c00,1,6,6,2,3)];
addChild(_particle);

}

//Respawn the particle
private function respawnParticle():void {

_particleLifespan = 0;
_xPos = 860;
_yPos = 60;
_vx = (Math.random() * 2 -2.4)*9;
_vy = _particleVelocity;
}

}
}

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The swf is being inserted into Worpress 2.7 footer.php. My Wordpress engine has 14 plugins installed and activated( I plan to go in to each plugin's code along with Wordpress' and optimize it soon). Is Wordpress a possible suspect for the slowness?

Boomer.fla's dimensions are 950 pixels in width and 625 pixels in height. I'd rather Boomer.fla only be 605x196 and set noscale and 100%x100% in hopes of the sprites reaching the user's whole screen, but they always cut off at the FLAs dimensions.