Lora E32 TTl 100 arduino : How to improve transmission time?

Hi, I have two lora E32 TTL 100 modules but when I run tests, I get a trasmission time around 2s. In order to drive my robot, I would like it to be around 100µs. Do you have any ideas of code ou parameters I could use ? Thanks

Receiver code :

  if (loraSerial.available() > 0) {
    String input = loraSerial.readString();

Transmitter code :

 if (Serial.available() > 0) {
    String input = Serial.readString();

I have the same question! :) :) :)