Thank you, but I've already tried that. So it increases the number of data values in one data bundle, but still there are ~50ms between two data bundles. Or not just data bundles but any kind of output. So when I just e.g. just do:
void loop() {
Serial.println("1");
}
And I print this out with timestamps on my serial monitor, I get:
09:50:04.666 -> 1
09:50:04.666 -> 1
09:50:04.713 -> 1
09:50:04.713 -> 1
09:50:04.713 -> 1
09:50:04.713 -> 1
[...]
So between one bundle of prints and next one are ~50ms even with baudrates of 115200 and more