====== Network connections ======
There is a whole array of devices between you and the target server daemon, so any of those can be slow. Usually it looks like this from your browser to the website:

  * Browser
  * Network Manager
  * Operating System (OS)
  * Network Card
  * Cable / WiFi (aka WLAN)
  * Switch or Access Point
  * Router
  * Modem
  * Wall Plug
  * box in basement (either active, like with most DOCSIS installations, or passive with VDSL)
  * copper or fibre cable
  * box on street containing ISP network devices
  * fibre channel to local ISP backbone
  * local backbone network devices
  * more centralised peering point
  * Central Internet Exchange (CIX)
  * another CIX
  * peering point
  * data centre uplink
  * data centre core modem
  * core router
  * core switch
  * rack switch
  * hypervisor's (HV) network card
  * HV OS and virtualisation software (e.g. XCP-ng)
  * virtual machine (VM) network interface
  * VM OS
  * server daemon for reverse proxy on VM (e.g. HAProxy, Envoy)
  * VM OS, network interface, HV, rack switch, another HV, another VM's network interface and OS
  * web server daemon (e.g. nginx, Apache2)
  * backend server daemon (e.g. Apache Tomcat, node.js, PHP FPM, Django, Golang binary)
  * the actual application's routing library (e.g. Nio, Gorilla)