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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.

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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.