diff --git a/keyserver/package.json b/keyserver/package.json
--- a/keyserver/package.json
+++ b/keyserver/package.json
@@ -51,6 +51,7 @@
     "JSONStream": "^1.3.5",
     "bad-words": "^3.0.4",
     "common-tags": "^1.7.2",
+    "compression": "^1.7.4",
     "cookie-parser": "^1.4.3",
     "dateformat": "^3.0.3",
     "detect-browser": "^4.0.4",
diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
--- a/keyserver/src/keyserver.js
+++ b/keyserver/src/keyserver.js
@@ -2,6 +2,7 @@
 
 import olm from '@commapp/olm';
 import cluster from 'cluster';
+import compression from 'compression';
 import cookieParser from 'cookie-parser';
 import crypto from 'crypto';
 import express from 'express';
@@ -116,6 +117,7 @@
 
   if (!cluster.isMaster || isCPUProfilingEnabled) {
     const server = express();
+    server.use(compression());
     expressWs(server);
     server.use(express.json({ limit: '250mb' }));
     server.use(cookieParser());