Yeah, I don’t really understand what the difference in latencies reported here would mean for the observed latency distribution of an actual end-to-end test. The latencies reported here are less than the difference in latency one should expect between the top and bottom of a screen (depending on vsync…). The repeatable way to measure these things is with a little embedded device which pretends to be a keyboard and uses a light sensor, but that’s a lot of work to set up even if you don’t need to take and label a bunch of videos yourself.