Characterizing Latency in Touch and Button-Equipped Interactive Systems
summary
A low-cost setup uses a vibration sensor on the finger and a photodiode on the screen connected to a microcontroller speaking Raw HID at 1000 Hz to timestamp touch and display changes. Measured tap input latency sits around 15–30 ms while most delay is output-side, typically 90–250 ms across devices; doubling display refresh reduces ~16 ms, and an observed MacBook trackpad path shows >230 ms that falls to ~30 ms when a second finger is present. Source and hardware are published.
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chapters (7)
- 0:00Introduction to latency
- 2:36Low-cost latency measurement technique
- 6:35Hardware and software probes
- 9:59Impact of input/output frequency
- 11:47Toolkits and device comparisons
- 13:13Latency on trackpads and keyboards
- 14:20Conclusion and recommendations
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