ESP32 serial port performances

[ghost]

Hi,

I've been testing the reaction time of the serial port. I'm sending a single byte to the ESP32, and answer with another byte. Measuring with a scope, there is around 26ms between the end of the request and the start of the response, which is a bit underwhelming.
I've tested with the DataReceived event while the Main is infinitely sleeping, as well as a while(true) checking BytesToRead.

Is this the expected reaction time? Or is this coming from the transceiver? Or did I miss a setting?