* To-do
** Perhaps use overlay for /etc for speedup
#+begin_src nix
  system.etc.overlay.enable = true;
#+end_src
** read https://nixos.org/manual/nixos/stable/
** Performance for mini pc
#+begin_src nix
  security.pam.loginLimits = [
    { domain = "@users"; item = "rtprio"; type = "-"; value = 1; }
  ];
#+end_src