subscriberView Too slow or caught React-Native-opentok

Question

I am using callstakio’s React-Native-opentok, when using only Subscriber it works normal, but when used Subscriber+Publisher Subscriber does not work properly.

render() {

    return (
        <View>

           <SubscriberView
              apiKey={OPENTOK_API_KEY}
              sessionId={SESSION_ID}
              token={PUBLISHER_TOKEN}
              style={{ width: x, height: y-200}}
          />

          <PublisherView
              apiKey={OPENTOK_API_KEY}
              sessionId={SESSION_ID}
              token={PUBLISHER_TOKEN}
              style={{ width: x, height: 200}}
          />
        </View>

    );
}

}