diff --git a/bin/bundler.mjs b/bin/bundler.mjs
index e0628abf..e63aba3e 100644
--- a/bin/bundler.mjs
+++ b/bin/bundler.mjs
@@ -56,6 +56,20 @@ const dataParts = [];
 const entryMeta = [];
 let offset = 0;
 let cache = new Map();
+let compEnable = (envcomp ?? compress);
+let cacheDir = cfg.cacheDir ?? ".bcache";
+
+if (compEnable) {
+    fs.mkdirSync(cacheDir, { recursive: true });
+}
+
+function fileTime(path) {
+    try {
+        return (fs.statSync(path).ctimeMs/1000) | 0;
+    } catch (e) {
+        return 0;
+    }
+}
 
 for (const { file, virt } of entries) {
     if (excludes.indexOf(file) >= 0) {
@@ -68,20 +82,28 @@ for (const { file, virt } of entries) {
     } else {
         if (debug) console.log({ write: virt, from: file });
         let data = fs.readFileSync(file);
-        if ((envcomp ?? compress) && file.endsWith("js")) {
-            console.log('compress', file);
-            data = uglify.minify(data.toString(), {
-                compress: {
-                    merge_vars: false,
-                    unused: false
+        if (compEnable && file.endsWith("js")) {
+            let cpath = path.resolve(cacheDir, file);
+            if (fileTime(cpath) > fileTime(file)) {
+                data = fs.readFileSync(cpath);
+                console.log('cached', file);
+            } else {
+                console.log('compress', file);
+                data = uglify.minify(data.toString(), {
+                    compress: {
+                        merge_vars: false,
+                        unused: false
+                    }
+                });
+                // console.log({ to: typeof(data), data });
+                if (!data.code) {
+                    if (debug) console.log({ skip: file });
+                    continue;
                 }
-            });
-            // console.log({ to: typeof(data), data });
-            if (!data.code) {
-                if (debug) console.log({ skip: file });
-                continue;
+                data = Buffer.from(data.code);
+                fs.mkdirSync(path.dirname(cpath), { recursive: true });
+                fs.writeFileSync(cpath, data);
             }
-            data = Buffer.from(data.code);
         }
         record = { virt, offset, length: data.length };
         cache.set(file, record);
diff --git a/package.json b/package.json
index 0720297b..ef499c79 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,7 @@
         "webpack-cli": "^5.1.4"
     },
     "scripts": {
-        "setup": "npm run setup-mods && npm i && npm run clean && npm run dev -- --dryrun && npm run webpack-ext",
+        "setup": "npm run setup-mods && npm i && npm run clean && npm run dev -- --alt --dryrun && npm run webpack-ext",
         "setup-mods": "cd mods && npm i",
         "build": "npm run prebuild && electron-builder",
         "build-nopublish": "npm run prebuild && electron-builder --publish never",
@@ -92,13 +92,13 @@
         "build-win-arm": "npm run build -- --win --arm64",
         "build-mac": "npm run build -- --mac --arm64",
         "build-mac-intel": "npm run build -- --mac --x64",
-        "clean": "rm -rf build data dist src/pack tmp src.old web.old",
+        "clean": "rm -rf build data dist src/pack tmp src.old web.old .bcache",
         "docs-dev": "docusaurus start --config conf/docusaurus.config.js",
         "docs-build": "docusaurus build --config conf/docusaurus.config.js",
         "docs-serve": "docusaurus serve --config conf/docusaurus.config.js",
         "docs-check": "prettier --config ./conf/prettier.config.js ./docs --check",
         "dev": "npm run webpack-ext && gs-app-server --debug --single",
-        "prod": "npm run webpack-ext && npm run webpack-src prod && gs-app-server",
+        "prod": "npm run webpack-ext && npm run webpack-src prod && COMPRESS=1 node bin/bundler.mjs && gs-app-server",
         "prod-pack": "npm run webpack-ext && npm run webpack-src prod",
         "prod-dryrun": "gs-app-server --dryrun",
         "start": "npm run prebuild prod && electron .",