Google uses a cool robot called the TouchBot to test Android and Chrome OS for end-to-end latency: the time it takes for appropriate elements to appear on the display after your finger hits the touchscreen. By analyzing the data from the system's high-speed camera, Google's software developers and engineers can identify and address issues in their operating systems.

The TouchBot was built by Finnish company OptoFidelity, and the software that powers the robot is fully open source and publicly available to analyze. The video above shows the TouchBot running through a series of web-based latency tests on a collection of Nexus devices, showing a clear time difference between touchscreen interaction and display refresh.

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