attachMovieClip(); problem - lag

programming flash
1

I’m making a game that makes lines after a moving object. First I used the dulpicateMovieClip(); function but that made it lag. So then I modified the script to attachMovieClip(); this still makes it lag after awhile. None of the movie clips I am duplicating have script in them. Also after awhile I use the unloadMovieClip(); function but it still lags. I have also used the removeMovieClip(); function

Here is some of the script:


if (mySpeed>.5) {
   _root.trail1.createEmptyMovieClip("1trail"+i, count);
   _root.trail1["1trail"+i].lineStyle(10, 0x0099FF, 20);
   _root.trail1["1trail"+i].moveTo(car._x, car._y);
   _root.trail1["1trail"+i].lineTo(newcarX, newcarY);
   count += 1;
   i++;
   _root.trail1array[_root.trail1arraySize] = i;
   _root.trail1arraySize++;
   updateAfterEvent();
  }

and


for (l=0; l<_root.lazerarraySize; l++) {
   if (_root.wall1.hitTest(_root["bluelaz"+_root.lazerarray[l]]._x, _root["bluelaz"+_root.lazerarray[l]]._y, true)) {
    _root["bluelaz"+_root.lazerarray[l]].play();
   } else {
    _root["bluelaz"+_root.lazerarray[l]]._x += Math.cos(Math.PI/180*(90-_root["bluelaz"+_root.lazerarray[l]]._rotation))*8;
    _root["bluelaz"+_root.lazerarray[l]]._y += -Math.sin(Math.PI/180*(90-_root["bluelaz"+_root.lazerarray[l]]._rotation))*8;
   }
  }

Note: in the one above blueLaz.play(); plays the movieclip and the at the end removes it.

Thanks for any help.