diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index e8b2bdc..fefb806 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -33,6 +33,12 @@ in {
   # exfat support
   boot.extraModulePackages = [ config.boot.kernelPackages.exfat-nofuse ];
 
+  zramSwap = 
+	{ enable = true;
+	  memoryPercent = 20;
+	};
+  boot.kernel.sysctl."vm.swappiness" = 9;
+
   # powermanagement
   services.tlp = 
     { enable = true;
@@ -145,6 +151,8 @@ in {
     gc-keep-outputs = true
     gc-keep-derivations = true
   '';
+  # use all cores for building
+  nix.buildCores = 0;
 
   # This value determines the NixOS release with which your system is to be
   # compatible, in order to avoid breaking some software such as database