Kevlin Henney describes thsi behaiviour neatly by combining Amdahl's law and a formular describing connections. I gave an presentation where i also shed light on thta. I call ith the "Kevlin Henney Conjecture": https://www.youtube.com/watch?v=l-WckUhhhII&list=PLY5suVncE-vfIoYDOLWggSOk0VtVcF7Tl&index=12&t=1319s