ILI9163 128x128 LCDs

Hi,

You could build your own firmware with support for the LCD built in, and that would be a lot faster.... Or since you have ESP32 you probably have enough free RAM to allocate one big buffer rather than using paletted.

The code for paletted is at https://github.com/espruino/EspruinoDocs/blob/master/devices/ILI9163.js#L107-L131

And I imagine the code to write the image direct with just a big buffer would be something like:

exports.connectBigBuffer = function(spi, dc, ce, rst, callback) {
  var g = Graphics.createArrayBuffer(LCD_WIDTH, LCD_HEIGHT, 16, { msb:true });
  g.flip = function() {
    ce.reset();
    spi.write(0x2A,dc);
    spi.write(0,0,0,LCD_WIDTH);
    spi.write(0x2B,dc);
    spi.write(0,0,0,LCD_HEIGHT);
    spi.write(0x2C,dc);
    spi.write(g.buffer);
    ce.set();
  };
  init(spi, dc, ce, rst, callback);
  return g;
};