ActionScript - 使用TweenLite和＆amp ;;的严重性能问题鼠标移动事件

private function mouseMoveEventHandler(evt:MouseEvent):void
    {
    evt.stopImmediatePropagation();

    startDrag();

    zoomTween = new TweenLite(this, 1.0, {dropShadowAmount: ZOOM_SHADOW, scaleX: 1.5, scaleY: 1.5, rotation: 10, onUpdate: updateDropShadow, onComplete: completeDropShadow, onCompleteParams: [ZOOM_SHADOW]});

    removeEventListener(MouseEvent.CLICK, mouseClickEventHandler);
    addEventListener(MouseEvent.MOUSE_UP, mouseUpEventHandler);
    addEventListener(MouseEvent.MOUSE_OUT, mouseUpEventHandler);
    }

private function updateDropShadow():void
    {
    filters = [new DropShadowFilter(dropShadowAmount, 90, 0x000000, 1.0, dropShadowAmount * 2, dropShadowAmount * 2, 1.0, 3)];
    }

private function completeDropShadow(dropShadowAmount:Number):void
    {
    this.dropShadowAmount = dropShadowAmount;
    }