Performance test == , === , ()

/**
 * Copyright leichtgewicht ( http://wonderfl.net/user/leichtgewicht )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/w4Ai
 */

package 
{
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.utils.getTimer;
    import flash.utils.setTimeout;

    public class Main extends Sprite
    {
        private var _t: TextField = new TextField();
        
        public function Main() {
            
            addChild( _t );
            _t.width = 200;
            _t.height = 200;
            setTimeout(start, 10);
        }
        
        public function start():void {
            var c: int = 100000000;
            var i: int;
            var a: MyType;
            
            for( i=0;i<c;++i) {
                a = null;
            }
            var t: Number;
            t = getTimer();
            for( i = 0; i<c; ++i) {
                if( a == null ) {}
            }
            t = getTimer()-t;
            trace("==", t);
            t = getTimer();
            for( i = 0; i<c; ++i) {
                if( a === null ) {}
            }
            t = getTimer()-t;
            trace("===",t);
            t = getTimer();
            for( i = 0; i<c; ++i) {
                if( a ) {}
            }
            t = getTimer()-t;
            trace("()",t);
        }
        
        protected function trace(msg:String, no:int):void {
            _t.appendText(msg+": "+no+" ms\n");
        }
    }
}

class MyType {
}