diff --git a/hosts/fw/configuration.nix b/hosts/fw/configuration.nix
index c682909..b9e4a9a 100644
--- a/hosts/fw/configuration.nix
+++ b/hosts/fw/configuration.nix
@@ -107,21 +107,7 @@
   ];
 
   nix = {
-    settings = {
-      auto-optimise-store = true;
-      # Build performance optimizations
-      max-jobs = 4;
-      cores = 4;
-      # Enable eval caching for faster rebuilds
-      eval-cache = true;
-      # Use binary caches to avoid unnecessary rebuilds
-      substituters = [
-        "https://cache.nixos.org"
-      ];
-      trusted-public-keys = [
-        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
-      ];
-    };
+    settings.auto-optimise-store = true;
     gc = {
       automatic = true;
       dates = "weekly";
@@ -137,8 +123,8 @@
   services.tlp = {
     enable = true;
     settings = {
-      CPU_SCALING_GOVERNOR_ON_AC = "performance"; # powersave or performance
-      CPU_ENERGY_PERF_POLICY_ON_AC = "performance"; # power or performance
+      CPU_SCALING_GOVERNOR_ON_AC = "powersave"; # powersave or performance
+      CPU_ENERGY_PERF_POLICY_ON_AC = "power"; # power or performance
       # CPU_MIN_PERF_ON_AC = 0;
       # CPU_MAX_PERF_ON_AC = 100; # max 100
     };
diff --git a/hosts/fw/modules/gitea-vm.nix b/hosts/fw/modules/gitea-vm.nix
index 734f306..33155cb 100644
--- a/hosts/fw/modules/gitea-vm.nix
+++ b/hosts/fw/modules/gitea-vm.nix
@@ -62,11 +62,6 @@ in {
           container = {
             network = "podman";
           };
-          cache = {
-            enabled = true;
-            host = "${config.networkPrefix}.97.5${toString idx}";  # LAN IP of the machine running act_runner
-            port = 8088;                                           # any free TCP port
-          };
         };
       };
 
diff --git a/hosts/fw/modules/microvm.nix b/hosts/fw/modules/microvm.nix
index 1270ac9..30ee742 100644
--- a/hosts/fw/modules/microvm.nix
+++ b/hosts/fw/modules/microvm.nix
@@ -2,8 +2,6 @@
 {
   imports = [ (builtins.fetchGit {
     url = "https://github.com/astro/microvm.nix";
-    ref = "main";
-    rev = "42628f7c61b02d385ce2cb1f66f9be333ac20140";
   } + "/nixos-modules/host") ];
 
   systemd.network.networks."31-server".matchConfig.Name = [ "vm-*" ];