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# It's not going to be the speed of light.
Maybe a third, or a half, or two thirds. This depends on something or other to do with wires, I'm pretty sure, yup.
(, Fri 11 Sep 2009, 1:40, archived)
# Yeah, on copper makes a big difference.
The local speed of propagation/light/energy is slower. 66%ish for rough calculations.
en.wikipedia.org/wiki/Speed_of_electricity
(, Fri 11 Sep 2009, 1:46, archived)
# You're mostly right. I used to work in Cable TV, We would see up to 80% for very good coaxial cabling
Twisted pair cabling is a bit lower.

en.wikipedia.org/wiki/Wave_propagation_speed
(, Fri 11 Sep 2009, 1:55, archived)