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Pen drawing for UIs. The ideal case is to update a small portion of the screen at about 240hz, to provide a good simulation of pen/pencil feedback. Really, your latency envelope should be on the order of the propagation of sound through the barrel of the marking device, but screens don’t update that fast.

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You are probably thinking https://www.youtube.com/watch?v=vOvQCPLkPt4

Bottleneck is in the input layer. While using a desktop computer look at the mouse cursor, now move the mouse - hardware accelerated 2D graphics, imperceptible latency.

Low latency thru orthogonal multiplexing https://www.youtube.com/watch?v=t1VcC9_yhc0

Surely >95% of screens out there right now are running at 60Hz, so 240Hz "pen drawing" is pretty niche and not a priority?

And >95% of screens don’t support pen drawing.

I expect a screen that supports or is designed for pen drawing to be somewhat more likely to be above 60Hz. All of these things are niche things that not many care about, but in any case, it’d be nice to be able to do better. And like with Formula 1 race cars, benefits from high-end techniques tend to trickle down to other more mainstream targets in time.

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