Timing of various functions on ATMEGA 328P chip (Arduino Uno, Arduino Nano, etc) [stub]

Using Arduino Programming Questions
20

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);
}