A real 500fps terminal (with 500Hz display) would be nice, because timing jitter would be very low no matter what keyboard autorepeat rate you used. Autorepeat would appear smooth even when the frame rate isn't an integer multiple of the repeat rate. Although in practice something like 120fps is probably sufficient if used with MPV-style motion interpolation.

The article explains the benefits only needing 2ms to render a frame, and how v-sync means it won't actually be displaying at 500fps.