diff --git a/package-lock.json b/package-lock.json
index bb24b07..e6f58f1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -351,6 +351,15 @@
         "@types/node": "*"
       }
     },
+    "@types/compression": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/@types/compression/-/compression-1.7.0.tgz",
+      "integrity": "sha512-3LzWUM+3k3XdWOUk/RO+uSjv7YWOatYq2QADJntK1pjkk4DfVP0KrIEPDnXRJxAAGKe0VpIPRmlINLDuCedZWw==",
+      "dev": true,
+      "requires": {
+        "@types/express": "*"
+      }
+    },
     "@types/connect": {
       "version": "3.4.33",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.33.tgz",
@@ -1116,6 +1125,28 @@
         "delayed-stream": "~1.0.0"
       }
     },
+    "compressible": {
+      "version": "2.0.18",
+      "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.18.tgz",
+      "integrity": "sha512-AF3r7P5dWxL8MxyITRMlORQNaOA2IkAFaTr4k7BUumjPtRpGDTZpl0Pb1XCO6JeDCBdp126Cgs9sMxqSjgYyRg==",
+      "requires": {
+        "mime-db": ">= 1.43.0 < 2"
+      }
+    },
+    "compression": {
+      "version": "1.7.4",
+      "resolved": "https://registry.npmjs.org/compression/-/compression-1.7.4.tgz",
+      "integrity": "sha512-jaSIDzP9pZVS4ZfQ+TzvtiWhdpFhE2RDHz8QJkpX9SIpLq88VueF5jJw6t+6CUQcAoA6t+x89MLrWAqpfDE8iQ==",
+      "requires": {
+        "accepts": "~1.3.5",
+        "bytes": "3.0.0",
+        "compressible": "~2.0.16",
+        "debug": "2.6.9",
+        "on-headers": "~1.0.2",
+        "safe-buffer": "5.1.2",
+        "vary": "~1.1.2"
+      }
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
diff --git a/package.json b/package.json
index b7f64d4..d2a1c46 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "update-client-hash": "node -e \"require('fs').writeFileSync('public/misc/hash.txt', require('randomstring').generate())\"",
     "debug-client": "tsc-watch --project ./public/js-source",
     "debug-server": "tsc-watch --onSuccess \"node --enable-source-maps --use-openssl-ca --unhandled-rejections=strict ./out/index\"",
-    "debug": "concurrently \"npm run debug-client\" \"npm run debug-server\"",
+    "debug": "concurrently npm:debug-*",
     "build": "tsc",
     "production": "node --use-openssl-ca --unhandled-rejections=strict ./out/index",
     "install-debug": "npm install && npm run build",
@@ -17,6 +17,7 @@
   },
   "dependencies": {
     "@10xjs/polyfill-analyzer": "^0.1.0",
+    "compression": "^1.7.4",
     "connect-redis": "^5.0.0",
     "cookie-parser": "~1.4.4",
     "env-var": "^6.3.0",
@@ -36,6 +37,7 @@
     "winston": "^3.3.3"
   },
   "devDependencies": {
+    "@types/compression": "^1.7.0",
     "@types/connect-redis": "0.0.15",
     "@types/express": "^4.17.8",
     "@types/express-session": "^1.17.1",
diff --git a/src/app.ts b/src/app.ts
index e4648a1..3009616 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -5,10 +5,12 @@ import * as path from 'path';
 import * as redisStore from 'connect-redis';
 import * as session from 'express-session';
 import * as sassMiddleware from 'node-sass-middleware';
+import * as compression from 'compression';
 import indexRouter from './routes';
 import {HttpLogger, Redis, Config, setupAuthProxy, getReloadRouter, polyfillRoute} from './utils';
 import {Store} from 'express-session';
 
+
 export const app = express();
 
 // view engine setup
@@ -26,6 +28,9 @@ app.use(HttpLogger);
 app.use(express.json());
 app.use(express.urlencoded({extended: false}));
 
+// compression
+app.use(compression);
+
 // auth proxy middleware
 router.use(setupAuthProxy);
 // auto reloader (when running in debug mode)
diff --git a/src/utils/polyfill.ts b/src/utils/polyfill.ts
index 1f6a1e6..709eef7 100644
--- a/src/utils/polyfill.ts
+++ b/src/utils/polyfill.ts
@@ -16,7 +16,7 @@ const features = new WaitForSync<PolyfillFeatureList>();
 	return feats;
 })()
 	.then(feats => {
-		Logger.debug("Polyfill analysed:", feats);
+		Logger.debug("Polyfill analysed:", Object.keys(feats));
 		features.setData(feats);
 	})
 	.catch(err => features.setError(err));