diff --git a/aio/angular.json b/aio/angular.json
index fa0fe632e4..7b55cfd846 100644
--- a/aio/angular.json
+++ b/aio/angular.json
@@ -75,10 +75,12 @@
                 "input": "src/styles.scss"
               }
             ],
-            "scripts": [],
-
+            "scripts": []
           },
           "configurations": {
+            "fast": {
+              "optimization": false
+            },
             "next": {
               "fileReplacements": [
                 {
@@ -111,6 +113,9 @@
             "browserTarget": "site:build"
           },
           "configurations": {
+            "fast": {
+              "browserTarget": "site:build:fast"
+            },
             "next": {
               "browserTarget": "site:build:next"
             },
@@ -232,4 +237,4 @@
       "prefix": "aio"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/aio/package.json b/aio/package.json
index 3c98130a5a..6ee8b4c9f6 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -12,7 +12,7 @@
     "aio-use-npm": "node tools/ng-packages-installer restore .",
     "aio-check-local": "node tools/ng-packages-installer check .",
     "ng": "yarn check-env && ng",
-    "start": "yarn check-env && ng serve",
+    "start": "yarn check-env && ng serve --configuration=fast",
     "build": "yarn build-for stable",
     "prebuild-for": "yarn setup",
     "build-for": "yarn ~~build --configuration",