{
  services.beesd.filesystems = {
    root = {
      spec = "LABEL=NixOS";
      hashTableSizeMB = 128;
      verbosity = "crit";
      extraOptions = [ "--loadavg-target" "1.5" ];
    };
  };
  services.fstrim.enable = true;
  services.system76-scheduler = {
    enable = true;
    settings = {
      processScheduler = {
        foregroundBoost = {
          #background = {
          #  ioClass = "idle";
          #};
          foreground = {
            ioClass = "realtime";
            class = "fifo";
          };
        };
        pipewireBoost.profile = {
          ioClass = "realtime";
          class = "fifo";
        };
      };
    };
  };
  services.power-profiles-daemon.enable = true;
  systemd.coredump = { # https://discourse.nixos.org/t/how-to-completely-disable-coredump/77335/11
    enable = true;
    settings.Coredump = {
      Storage = "none";
      ProcessSizeMax = "0";
  };
  zramSwap = {
    enable = true;
    algorithm = "zstd";
    memoryPercent = 90;
  };
  hardware.block.scheduler = {
    "mmcblk[0-9]*" = "bfq";
    "nvme[0-9]*"   = "kyber";
    "sd[a-z]"      = "kyber";
  };
  services.scx = {
    enable = true;
    scheduler = "scx_cake";
  };
}