The sluggish speed of light means that you’d have to arrange the components of your phone to work in parallel as much as possible. That way, a computation at one end wouldn’t be stuck waiting for a result of a computation at the other. This sounds ridiculous, but modern computers have exactly this problem. If a chip is running at 3 GHz, light—and electric signals—don’t have time to cross from one end of the computer to the other during a single clock cycle. Different parts of your computer are out of sync with one another. If two parts are going to go back and forth quickly, circuit board
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