Serial text command to pan tilt servos

Forum 2005-2010 (read only) General Frequently-Asked Questions
35 
void readSerialString () {
  while(Serial.available() > 0)  // will do until gets full line
  {
    int iBuffer = Serial.read(); // if something comes in save it
 
  if(iBuffer == '.') 
          break;  // but we may never get here!
 
    cString[iBufferIndex]  = iBuffer; // add it to string
    iBufferIndex++;
    cString[iBufferIndex]= '\0'; // make sure our last element is nothing
   
    Serial.print( iBuffer , BYTE); // echo back
    
    //delay(5); // for whatever reason, Arduino needs this or read doesn't finish
  }
}

Thanks! Can you explain why the sketch works with the delay and not without it?