done

nixos/configuration.nix

@@ -157,6 +157,15 @@
     mesa
     libGL
     dbus
+    
+    # Lightweight alternatives for X11 forwarding
+    firefox  # Often faster than Chromium over X11
+    qutebrowser  # Keyboard-driven lightweight browser
+    
+    # X11 performance tools
+    xorg.xset
+    xorg.xdpyinfo
+    xorg.xwininfo
   ];
 
   # Enable X11 forwarding support
@@ -173,4 +182,14 @@
     ];
     fontconfig.enable = true;
   };
+
+  # X11 performance optimizations
+  environment.variables = {
+    # Disable some heavy X11 features for better performance over SSH
+    "_JAVA_AWT_WM_NONREPARENTING" = "1";
+    # Optimize Qt applications for X11 forwarding
+    "QT_X11_NO_MITSHM" = "1";
+    # Disable some graphics acceleration that doesn't work well over SSH
+    "LIBGL_ALWAYS_INDIRECT" = "1";
+  };
 }