One more way to think about it is the propagation delay of a transmission line, or actually the opposite of that, which is the velocity factor, proportional to

One more way to think about it is the propagation delay of a transmission line, or actually the opposite of that, which is the velocity factor, proportional to 1/sqrt(LC): https://en.wikipedia.org/wiki/Wave_propagation_speed https://en.wikipedia.org/wiki/Wave_propagation_speed Coaxial cables are great for blocking interference because one conductor is inside the other, so external electric fields can't penetrate. But they have a high parasitic capacitance because the outside conductor has a large surface area. So if capacitance is causing too much propagation delay, you can use twisted pair. It also works to avoid interference, but because the wires constantly change position in relation to electric fields: https://en.wikipedia.org/wiki/Twisted_pair https://en.wikipedia.org/wiki/Twisted_pair The problem with coax for cable TV though is that for high frequencies, losses can be high because the capacitor begins to approximate a conductor (and TV uses really high frequencies!). So cable length becomes a limitation. Then you use fiber optic cables (I find total internal reflection somewhat miraculous, like an optical analog to superconductors). Also in computer chips, parasitic capacitance is a problem because capacitance grows with area and shrinks with distance. But the conductors are so close to one another that even a small area results in a large capacitance. That's why the latency to memory can be orders of magnitude higher than say, cache. Optical interconnects would help here as well. It's been 15 years since I studied this stuff though, so if I misremembered, somebody please correct me!