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If the average computer motherboard is a foot long, and an electrical signal has to traverse the entire distance, it takes approximately 10^^-9 seconds to make the journey.

By comparison, if that same signal has to travel the entire circumference of the globe -- about 25,000 miles -- it takes a little over a tenth of a second.

The average human reaction time to perceive an event and respond to it is somewhere in the range of .5 to .75 seconds.

So a light impulse can travel around the world at least 5 times before we even know it left.

Say what you will, for human purposes on this planet, the speed of light is plenty fast.