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Keyboard button press to screen response is ~100ms whereas an Apple IIe was 35ms.



Apple had the iPad Pro pencil latency down to 30ms in 2017: https://danluu.com/input-lag/


How'd you measure that?


Most measurements were taken with the 240fps camera (4.167 ms resolution) in the iPhone SE. Devices with response times below 40 ms were re-measured with a 1000fps camera (1 ms resolution), the Sony RX100 V in PAL mode.




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