An explosion has to be the quickest way overall. A heart attack might be quick by natural standards, but it's quite a while before you even lose consciousness if your heart stops.
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The drift speed of an individual electron in a current-carrying copper wire is about equivalent to fast walking pace.
it is the electrical field that travels at something like the speed of light (for typical conductor geometries, pulses travel at about 2/3 the speed of light).
flicker can be sensed in peripheral vision at higher frequencies than in foveal vision