diff --git a/config/environments/development.js.example b/config/environments/development.js.example
index d684cd7f..630b7091 100644
--- a/config/environments/development.js.example
+++ b/config/environments/development.js.example
@@ -63,6 +63,7 @@ var config = {
         */
         row_limit: 65535,
         simplify_geometries: true,
+        use_overviews: true, // use overviews to retrieve raster
         /*
          * Set persist_connection to false if you want
          * database connections to be closed on renderer
diff --git a/config/environments/production.js.example b/config/environments/production.js.example
index 54b85364..8d20f27a 100644
--- a/config/environments/production.js.example
+++ b/config/environments/production.js.example
@@ -65,6 +65,7 @@ var config = {
          */
         persist_connection: false,
         simplify_geometries: true,
+        use_overviews: true, // use overviews to retrieve raster
         max_size: 500
     }
     ,mapnik_version: undefined
diff --git a/config/environments/staging.js.example b/config/environments/staging.js.example
index 23baf426..8b1ba7a8 100644
--- a/config/environments/staging.js.example
+++ b/config/environments/staging.js.example
@@ -57,6 +57,7 @@ var config = {
         extent: "-20037508.3,-20037508.3,20037508.3,20037508.3",
         row_limit: 65535,
         simplify_geometries: true,
+        use_overviews: true, // use overviews to retrieve raster
         /*
          * Set persist_connection to false if you want
          * database connections to be closed on renderer
diff --git a/config/environments/test.js.example b/config/environments/test.js.example
index db807c85..e2882331 100644
--- a/config/environments/test.js.example
+++ b/config/environments/test.js.example
@@ -57,6 +57,7 @@ var config = {
         extent: "-20037508.3,-20037508.3,20037508.3,20037508.3",
         row_limit: 65535,
         simplify_geometries: true,
+        use_overviews: true, // use overviews to retrieve raster
         /*
          * Set persist_connection to false if you want
          * database connections to be closed on renderer
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index f3656c7b..0303b8fb 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -94,7 +94,7 @@
             },
             "inherits": {
               "version": "2.0.1",
-              "from": "inherits@2"
+              "from": "inherits@~2.0.1"
             }
           }
         }
@@ -1528,7 +1528,7 @@
             },
             "sphericalmercator": {
               "version": "1.0.2",
-              "from": "sphericalmercator@~1.0.2"
+              "from": "sphericalmercator@~1.0.1"
             }
           }
         },