another one :D

system/opt/gamemode/default.nix

@@ -0,0 +1,29 @@
+{
+  pkgs,
+  inputs,
+  ...
+}: {
+  programs.gamemode = {
+    enable = true;
+    settings = {
+      general = {
+        softrealtime = "auto";
+        renice = 15;
+      };
+      # gpu = {
+      #   apply_gpu_optimisations = "accept-responsibility";
+      #   gpu_device = 1;
+      #   amd_performance_level = "high";
+      # };
+      custom = {
+        start = "${pkgs.libnotify}/bin/notify-send 'GameMode started'";
+        end = "${pkgs.libnotify}/bin/notify-send 'GameMode ended'";
+      };
+    };
+  };
+  # see https://github.com/fufexan/nix-gaming/#pipewire-low-latency
+  services.pipewire.lowLatency.enable = true;
+  imports = [
+    inputs.nix-gaming.nixosModules.pipewireLowLatency
+  ];
+}