Ideas for improving LCD speed

[picouser]

@Ben

RGB565 does work. You need to output 0x55 to register 0x3A when setting up the display.

Knock yourself out trying. IT DOESN’T WORK. It can work on displays like some of the Waveshare ones that use an external shift register and actually connect to the display in parallel mode. In that case 0x55 is correct but RGB565 is not supported by straight 3 or 4 wire SPI. The ILI9488 datasheet is clear on this.