Touch events slowing display in air android

1

I’m still having some problems understanding these touch events…or maybe something else…can anyone enlighten me as to what i’m doing wrong in this code?? Only left as1&2 to go to 3 recently so I’m sure I have bad habits and misconceptions but…

In the IDE i have a button on the stage called: “touchBtn”
and a textfield called “timer”

the problem i have is that if i touch the button fast / lots, the display rate really slows down…I know this is down to something I’m doing totally wrong but not sure what…

all help and ridicule appreciated.

tinyflea

package {

import flash.display.MovieClip;
import flash.events.TouchEvent;
import flash.events.Event;    
import flash.utils.*;






public class dotty extends MovieClip {

public function dotty() {
touchBtn.addEventListener(TouchEvent.TOUCH_BEGIN, TouchBegin);
touchBtn.addEventListener(TouchEvent.TOUCH_END, TouchEnd);

        var theTime:int = 0;
        var Ypos:int=0;

function TouchBegin(event:TouchEvent):void{
Ypos=mouseY;
}
function TouchEnd(event:TouchEvent):void{
Ypos=mouseY;
}

addEventListener(Event.ENTER_FRAME,myFunction);

function myFunction(event:Event) {

theTime=getTimer();
timer.text=String(theTime);

}
}
}

}