diff --git a/flake.nix b/flake.nix
index 7a6ee3d..bdeb82a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -322,6 +322,8 @@
         };
       };
 
+      packages.gamja = pkgs.gamja;
+
       devShells.default = pkgs.mkShellNoCC {
         packages = [
           pkgs.rage
diff --git a/hosts/vno1-oh2/configuration.nix b/hosts/vno1-oh2/configuration.nix
index 93c474e..1c696d9 100644
--- a/hosts/vno1-oh2/configuration.nix
+++ b/hosts/vno1-oh2/configuration.nix
@@ -303,7 +303,7 @@
           abort @denied
           tls {$CREDENTIALS_DIRECTORY}/irc.jakstys.lt-cert.pem {$CREDENTIALS_DIRECTORY}/irc.jakstys.lt-key.pem
 
-          root * ${pkgs.gamja}
+          root * ${pkgs.gamja.passthru.data-compressed}
           file_server browse {
               precompressed br gzip
           }
diff --git a/pkgs/gamja.nix b/pkgs/gamja.nix
index d3c1e43..c259075 100644
--- a/pkgs/gamja.nix
+++ b/pkgs/gamja.nix
@@ -1,9 +1,14 @@
 {
   lib,
+  gamja,
   fetchFromSourcehut,
   buildNpmPackage,
+  runCommand,
   python3,
   writeText,
+  brotli,
+  zopfli,
+  xorg,
   # optional configuration attrSet, see https://git.sr.ht/~emersion/gamja#configuration-file for possible values
   gamjaConfig ? null,
 }:
@@ -32,6 +37,25 @@ buildNpmPackage rec {
     runHook postInstall
   '';
 
+  passthru = {
+    data-compressed =
+      runCommand "soju-data-compressed" {
+        nativeBuildInputs = [brotli zopfli xorg.lndir];
+      } ''
+        mkdir $out
+        lndir ${gamja}/ $out/
+
+        find $out \
+            -name '*.css' -or \
+            -name '*.js' -or \
+            -name '*.map' -or \
+            -name '*.webmanifest' -or \
+            -name '*.html' | \
+            tee >(xargs -n1 -P''$(nproc) ${zopfli}/bin/zopfli) | \
+            xargs -n1 -P''$(nproc) ${brotli}/bin/brotli
+      '';
+  };
+
   meta = with lib; {
     description = "A simple IRC web client";
     homepage = "https://git.sr.ht/~emersion/gamja";