You're right that CPUs probably weren't the best example. My point was more that there are everyday things that operate at timescales where nanoseconds matter.

You're right that CPUs probably weren't the best example. My point was more that there are everyday things that operate at timescales where nanoseconds matter. 55 us per day is larger than the effects of either special or general relativity on GPS, but both need to be accounted for in order for the system to be useful.