And, yes regardless of whether Serial.begin(value) is set to 9600 or 115200 or even 250000; the results of the timing of Serial.print(""); are the same...
This is extremely unlikely, and does not match the behavior of a simple test sketch I put together:
void setup() {
Serial.begin(256000);
pinMode(13, OUTPUT);
}
void loop() {
digitalWrite(13, HIGH);
Serial.println("hello");
digitalWrite(13, LOW);
}