The best ModeX variant I used was at the very edge of what the hardware and monitor could manage. 400x300 87Hz. I modified one of my games at the time to use

The best ModeX variant I used was at the very edge of what the hardware and monitor could manage. 400x300 87Hz. I modified one of my games at the time to use it and It was comically difficult to play because the movement was synced to the framerate and consequently played almost 50% faster. I always wanted to write a paint package for it using temporal dithering. You can get away with a lot with a 43Hz dither. Mixing colours of similar luminosity doesn't flicker annoyingly at all and gives you way more than 256 colours