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Hi @Gordon tried your suggestion too and can get it up to around 700khz on the clock and the bytes sent for each scan line are looking good but there are big gaps between while the control bytes are sent... see pic (single complete page redraw all 0xFF).
The good news is that a total screen redraw is around 40ms so framerate around 25. Not so bad.
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jugglingcats
It'd be interesting to try software SPI on ESP32. It'd almost certainly beat 100kHz and the time between bytes will probably be shorter too.