diff --git a/lib/omt.ejs b/lib/omt.ejs
index 2fb71493..7e64b3ad 100644
--- a/lib/omt.ejs
+++ b/lib/omt.ejs
@@ -13,6 +13,7 @@
 
 // If the loader is already loaded, just stop.
 if (!self.<%- amdFunctionName %>) {
+  Object.defineProperty(navigator, 'hardwareConcurrency', { value: 4 });
   let registry = {};
 
   const singleRequire = (uri, parentUri) => {
diff --git a/rollup.config.js b/rollup.config.js
index f4a57384..b793972a 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -129,7 +129,7 @@ export default async function ({ watch }) {
             resolve(),
             replace({ __PRERENDER__: false, __PRODUCTION__: isProduction }),
             entryDataPlugin(),
-            isProduction ? terser({ module: true }) : {},
+            //isProduction ? terser({ module: true }) : {},
           ],
           preserveEntrySignatures: false,
         },