Yes, its just the sending.
It's 3 to 6 times faster, depending on board.
EspruinoBoard still has to set bit by bit, correct me if I'm wrong.
ESP32 and mdbt42q sets register for 32 ports.
I'm creating my own build, see https://github.com/jumjum123/EspruinoExtensions/blob/master/General/LEDBoard/makeESPRUINOBOARD.sh
Executing in an interrupt, this might help for ESP32. There I have a delay from time to time as I can see with logicanalyzer. Will take some time, but I will check this.
This does not happen with your boards, at least I never found.
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