[stephen_g]

I would expect the last mile to generally be one of the larger contributors to latency unless you're traversing very long distances (i.e. cross country, undersea cables, etc.). For example, just looking now I get 23ms to a close speedtest server on my LTE and 3ms to the same server on my work's fibre connection. Going a larger distance (~1000km to the next large capital city) it's 43ms vs 18ms on the fibre. That's quite a significant difference, but not as bad as it used to be (3G could have hundreds of milliseconds of latency from device to tower).