[netr0ute]

By that definition, a phone call that always takes 10 seconds for one side to hear the other is realtime.

[AlotOfReading]

That would indeed be a realtime system by common definitions as long as that latency is guaranteed. Audio and video are commonly considered soft-realtime domains for exactly that reason.

[unsafecast]

Yep. If you mean low-latency, say that. Real-time is an unfortunate name, but it means what it means.

[numpad0]

And phone … callthatju arousmpnnd is n’t realtime.

Technically not relevant but I know that a lot of early handhelds that repurposed RTOS for GUI felt slow, jumpy and unresponsive, perhaps because everything was polled? In that sense RTOS can be slow.

[unsafecast]

I think it felt that way because of bad design + slow hardware. You see the exact same thing by installing a modern windows version or some desktop like GNOME to low-end computers.