What happens when you make a move in lichess.org?(davidreis.me)

  send = (t: string, d: any, o: any = {}, noRetry = false): void => {
    const msg: Partial<MsgOut> = { t };
    if (d !== undefined) {
      if (o.withLag) d.l = Math.round(this.averageLag);
      if (o.millis >= 0) d.s = Math.round(o.millis * 0.1).toString(36);
      msg.d = d;
    }
    if (o.ackable) {
      msg.d = msg.d || {}; // can't ack message without data
      this.ackable.register(t, msg.d); // adds d.a, the ack ID we expect to get back
    }

    const message = JSON.stringify(msg);
    ...

  private schedulePing = (delay: number): void => {
    clearTimeout(this.pingSchedule);
    this.pingSchedule = setTimeout(this.pingNow, delay);
  };

  private pingNow = (): void => {
    clearTimeout(this.pingSchedule);
    clearTimeout(this.connectSchedule);
    const pingData =
      this.options.isAuth && this.pongCount % 10 == 2
        ? JSON.stringify({
            t: 'p',
            l: Math.round(0.1 * this.averageLag),
          })
        : 'null';
    try {
      this.ws!.send(pingData);
      this.lastPingTime = performance.now();
    } catch (e) {
      this.debug(e, true);
    }
    this.scheduleConnect();
  };

  private computePingDelay = (): number => this.options.pingDelay + (this.options.idle ? 1000 : 0);

  private pong = (): void => {
    clearTimeout(this.connectSchedule);
    this.schedulePing(this.computePingDelay());
    const currentLag = Math.min(performance.now() - this.lastPingTime, 10000);
    this.pongCount++;

    // Average first 4 pings, then switch to decaying average.
    const mix = this.pongCount > 4 ? 0.1 : 1 / this.pongCount;
    this.averageLag += mix * (currentLag - this.averageLag);

    pubsub.emit('socket.lag', this.averageLag);
    this.updateStats(currentLag);
  };