Re: Bristol has a 5G testbed
I don't disagree, merely pointing out that the speed of light is not really the limiting factor here. Since all these latencies add up you do want low latency protocols, a few steps of 1ms are going to contribute significantly more than a few extra 0.1ms steps.
Good point about fibre speed, overlooked that, though if you are using something like a microwave link (and for the 5G portion) it doesn't apply. I understand that some of the high frequency trading people now use (or are moving to) microwave links for that reason. (Some days the differences between that industry and trading bitcoin are less than obvious...)