how Internet back in the copper wire days could still transmit data in seconds when Electrons flow through copper at a few metres per second.

Question

how Internet back in the copper wire days could still transmit data in seconds when Electrons flow through copper at a few metres per second.

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Answer 1

Imagine a jump rope. Two people each holds one end. The two agree to communicate by swinging the rope up and down causing a “wave” to flow from one end to another. None of the molecules in jump rope move from one end to another and yet the wave still moves.

This is electricity. Electrons don’t need to “flow” for an electrical circuit to send a signal. The energy of the signal is contained in waves. The speed of that wave is the speed of light.