Very good paper on the importance of #latency for Internet #speed (forget about #capacity, unless you work in high-energy particle physics, latency is what matters)
▻https://labs.ripe.net/Members/mirjam/why-is-the-internet-so-slow
The detailed paper: ▻https://users.cs.duke.edu/%7Eilker/papers/conference/pam17.pdf
Also, the Web site of the authors (C is for the #speed_of_light): ▻http://cspeed.net