serverSocket delay raise socketData event on mac os x 10.9.2

I have debugged my socket code, connection channel is established, but air.ProgressEvent.SOCKET_DATA event  be raised to receive data with delay 5-20 seconds, 5-20 seconds is not expected in local network.

Is there other people encounter the same question?  Is this bug causes by air runtime on mac?

My Js code:

function TCPServer(port){
  this.server = new air.ServerSocket;
  this.server.addEventListener(air.Event.CONNECT,TCPServer.onReceiveClientConnectionHandler);
  this.server.addEventListener(air.Event.CLOSE,TCPServer.onServerCloseHandler);
  this.server.bind(port);
  this.server.listen();
  this.clients = [];
  this.dispose = function (){
    this.server.close();
    this.server = null;
  }
}
TCPServer.onReceiveClientConnectionHandler = function (event) {
  var client = event.socket;
  TCPServer.getInstance().clients.push(client);
  air.trace("client connected.");
  client.addEventListener(air.ProgressEvent.SOCKET_DATA, TCPServer.onTransferDataHandler);
  client.addEventListener(air.Event.CLOSE, TCPServer.onClientCloseHandler);
  client.addEventListener(air.IOErrorEvent.IO_ERROR, TCPServer.onIOErrorHandler);
}
//This function delay raise for 5-20 seconds.
TCPServer.onTransferDataHandler = function (event) {
  air.trace("client received data.");
  var client = event.target;
}