Here’s how Google checks for lag on your Android phone

Yes, Google hates lag on smartphones as much as you do — enough so that the search giant has a robot dedicated to spotting that delay between your finger input and what happens on screen. Meet the Chrome TouchBot, an OptoFidelity-made machine that gauges the touchscreen latency on Android and Chrome OS devices.

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https://www.engadget.com/2015/06/28/google-chrome-touchbot/