diff --git a/core/composer.json b/core/composer.json
index 4a109a2..5610a0e 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -20,6 +20,7 @@
     "twig/twig": "1.12.1",
     "doctrine/common": "2.3.0",
     "guzzle/http": "3.1.0",
+    "guzzle/plugin-async": "3.1.0",
     "kriswallsmith/assetic": "1.1.0-alpha1",
     "symfony-cmf/routing": "dev-master#ea4a10",
     "easyrdf/easyrdf": "0.8.0-beta.1",
diff --git a/core/composer.lock b/core/composer.lock
index 8715a8e..4f7e1a5 100644
--- a/core/composer.lock
+++ b/core/composer.lock
@@ -1,5 +1,5 @@
 {
-    "hash": "a8c56a3549ec70f775e4bf795e65a993",
+    "hash": "ea4e5e5da86989b55eb693856d0a7088",
     "packages": [
         {
             "name": "doctrine/common",
@@ -268,6 +268,55 @@
             ]
         },
         {
+            "name": "guzzle/plugin-async",
+            "version": "v3.1.0",
+            "target-dir": "Guzzle/Plugin/Async",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/plugin-async",
+                "reference": "v3.0.7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/guzzle/plugin-async/archive/v3.0.7.zip",
+                "reference": "v3.0.7",
+                "shasum": ""
+            },
+            "require": {
+                "guzzle/http": "self.version",
+                "php": ">=5.3.2"
+            },
+            "time": "2012-12-07 16:45:11",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Guzzle\\Plugin\\Async": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Guzzle async request plugin",
+            "homepage": "http://guzzlephp.org/",
+            "keywords": [
+                "Guzzle",
+                "plugin"
+            ]
+        },
+        {
             "name": "guzzle/stream",
             "version": "v3.1.0",
             "target-dir": "Guzzle/Stream",
@@ -791,7 +840,7 @@
                 "symfony/http-kernel": ">=2.1,<2.3-dev",
                 "symfony/routing": ">=2.1,<2.3-dev"
             },
-            "time": "2013-01-21 20:33:16",
+            "time": "2013-01-24 16:09:01",
             "type": "library",
             "extra": {
                 "branch-alias": {
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 5f540a3..81d1277 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -8,8 +8,8 @@
 use Drupal\Core\Utility\ModuleInfo;
 use Drupal\Core\TypedData\Primitive;
 use Drupal\system\Plugin\block\block\SystemMenuBlock;
+use Guzzle\Plugin\Async\AsyncPlugin;
 use Symfony\Component\HttpFoundation\JsonResponse;
-use Symfony\Component\HttpFoundation\Response;
 
 /**
  * Maximum age of temporary files in seconds.
@@ -3726,7 +3726,18 @@ function system_run_automated_cron() {
   if (($threshold = config('system.cron')->get('threshold.autorun')) > 0 && variable_get('install_task') == 'done') {
     $cron_last = state()->get('system.cron_last') ?: NULL;
     if (!isset($cron_last) || (REQUEST_TIME - $cron_last > $threshold)) {
-      drupal_cron_run();
+      // Only execute the request if we can aquire the lock. If this fails then
+      // another request is already taking care of it and we don't have to
+      // retry.
+      if (lock()->acquire('cron_request')) {
+        // Execute the asynchronous request. This will return immediately with a
+        // HTTP/1.1 200 OK and X-Guzzle-Async as the singe header.
+        $url = url('cron/' . state()->get('system.cron_key'), array('absolute' => TRUE));
+        $request = drupal_container()->get('http_default_client')->get($url);
+        $request->addSubscriber(new AsyncPlugin());
+        $request->send();
+        lock()->release('cron_request');
+      }
     }
   }
 }
diff --git a/core/vendor/autoload.php b/core/vendor/autoload.php
index 5a49ae7..8892bbc 100644
--- a/core/vendor/autoload.php
+++ b/core/vendor/autoload.php
@@ -4,4 +4,4 @@
 
 require_once __DIR__ . '/composer' . '/autoload_real.php';
 
-return ComposerAutoloaderInit481bddffaf22b51d159ec1b257c2bd7f::getLoader();
+return ComposerAutoloaderInit4221fc054178f7eea0c7d285e1457cc4::getLoader();
diff --git a/core/vendor/composer/autoload_namespaces.php b/core/vendor/composer/autoload_namespaces.php
index 54b2551..fda22bc 100644
--- a/core/vendor/composer/autoload_namespaces.php
+++ b/core/vendor/composer/autoload_namespaces.php
@@ -21,6 +21,7 @@
     'Symfony\\Cmf\\Component\\Routing' => $vendorDir . '/symfony-cmf/routing/',
     'Psr\\Log\\' => $vendorDir . '/psr/log/',
     'Guzzle\\Stream' => $vendorDir . '/guzzle/stream/',
+    'Guzzle\\Plugin\\Async' => $vendorDir . '/guzzle/plugin-async/',
     'Guzzle\\Parser' => $vendorDir . '/guzzle/parser/',
     'Guzzle\\Http' => $vendorDir . '/guzzle/http/',
     'Guzzle\\Common' => $vendorDir . '/guzzle/common/',
diff --git a/core/vendor/composer/autoload_real.php b/core/vendor/composer/autoload_real.php
index 24c4d51..8cc7a99 100644
--- a/core/vendor/composer/autoload_real.php
+++ b/core/vendor/composer/autoload_real.php
@@ -2,7 +2,7 @@
 
 // autoload_real.php generated by Composer
 
-class ComposerAutoloaderInit481bddffaf22b51d159ec1b257c2bd7f
+class ComposerAutoloaderInit4221fc054178f7eea0c7d285e1457cc4
 {
     private static $loader;
 
@@ -19,9 +19,9 @@ public static function getLoader()
             return self::$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInit481bddffaf22b51d159ec1b257c2bd7f', 'loadClassLoader'));
+        spl_autoload_register(array('ComposerAutoloaderInit4221fc054178f7eea0c7d285e1457cc4', 'loadClassLoader'));
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
-        spl_autoload_unregister(array('ComposerAutoloaderInit481bddffaf22b51d159ec1b257c2bd7f', 'loadClassLoader'));
+        spl_autoload_unregister(array('ComposerAutoloaderInit4221fc054178f7eea0c7d285e1457cc4', 'loadClassLoader'));
 
         $vendorDir = dirname(__DIR__);
         $baseDir = dirname($vendorDir);
diff --git a/core/vendor/composer/installed.json b/core/vendor/composer/installed.json
index d272cdb..29549bf 100644
--- a/core/vendor/composer/installed.json
+++ b/core/vendor/composer/installed.json
@@ -834,207 +834,6 @@
         "homepage": "http://symfony.com"
     },
     {
-        "name": "guzzle/common",
-        "version": "v3.1.0",
-        "version_normalized": "3.1.0.0",
-        "target-dir": "Guzzle/Common",
-        "source": {
-            "type": "git",
-            "url": "git://github.com/guzzle/common.git",
-            "reference": "v3.1.0"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://github.com/guzzle/common/archive/v3.1.0.zip",
-            "reference": "v3.1.0",
-            "shasum": ""
-        },
-        "require": {
-            "php": ">=5.3.2",
-            "symfony/event-dispatcher": ">=2.1"
-        },
-        "time": "2013-01-13 05:14:34",
-        "type": "library",
-        "extra": {
-            "branch-alias": {
-                "dev-master": "3.0-dev"
-            }
-        },
-        "installation-source": "dist",
-        "autoload": {
-            "psr-0": {
-                "Guzzle\\Common": ""
-            }
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "MIT"
-        ],
-        "description": "Common libraries used by Guzzle",
-        "homepage": "http://guzzlephp.org/",
-        "keywords": [
-            "collection",
-            "common",
-            "event",
-            "exception"
-        ]
-    },
-    {
-        "name": "guzzle/stream",
-        "version": "v3.1.0",
-        "version_normalized": "3.1.0.0",
-        "target-dir": "Guzzle/Stream",
-        "source": {
-            "type": "git",
-            "url": "https://github.com/guzzle/stream",
-            "reference": "v3.1.0"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://github.com/guzzle/stream/archive/v3.1.0.zip",
-            "reference": "v3.1.0",
-            "shasum": ""
-        },
-        "require": {
-            "guzzle/common": "self.version",
-            "php": ">=5.3.2"
-        },
-        "time": "2012-12-07 16:45:11",
-        "type": "library",
-        "extra": {
-            "branch-alias": {
-                "dev-master": "3.0-dev"
-            }
-        },
-        "installation-source": "dist",
-        "autoload": {
-            "psr-0": {
-                "Guzzle\\Stream": ""
-            }
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "MIT"
-        ],
-        "authors": [
-            {
-                "name": "Michael Dowling",
-                "email": "mtdowling@gmail.com",
-                "homepage": "https://github.com/mtdowling"
-            }
-        ],
-        "description": "Guzzle stream wrapper component",
-        "homepage": "http://guzzlephp.org/",
-        "keywords": [
-            "Guzzle",
-            "component",
-            "stream"
-        ]
-    },
-    {
-        "name": "guzzle/parser",
-        "version": "v3.1.0",
-        "version_normalized": "3.1.0.0",
-        "target-dir": "Guzzle/Parser",
-        "source": {
-            "type": "git",
-            "url": "git://github.com/guzzle/parser.git",
-            "reference": "v3.1.0"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://github.com/guzzle/parser/archive/v3.1.0.zip",
-            "reference": "v3.1.0",
-            "shasum": ""
-        },
-        "require": {
-            "php": ">=5.3.2"
-        },
-        "time": "2013-01-12 21:43:21",
-        "type": "library",
-        "extra": {
-            "branch-alias": {
-                "dev-master": "3.0-dev"
-            }
-        },
-        "installation-source": "dist",
-        "autoload": {
-            "psr-0": {
-                "Guzzle\\Parser": ""
-            }
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "MIT"
-        ],
-        "description": "Interchangeable parsers used by Guzzle",
-        "homepage": "http://guzzlephp.org/",
-        "keywords": [
-            "URI Template",
-            "cookie",
-            "http",
-            "message",
-            "url"
-        ]
-    },
-    {
-        "name": "guzzle/http",
-        "version": "v3.1.0",
-        "version_normalized": "3.1.0.0",
-        "target-dir": "Guzzle/Http",
-        "source": {
-            "type": "git",
-            "url": "git://github.com/guzzle/http.git",
-            "reference": "v3.1.0"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://github.com/guzzle/http/archive/v3.1.0.zip",
-            "reference": "v3.1.0",
-            "shasum": ""
-        },
-        "require": {
-            "ext-curl": "*",
-            "guzzle/common": "self.version",
-            "guzzle/parser": "self.version",
-            "guzzle/stream": "self.version",
-            "php": ">=5.3.2"
-        },
-        "time": "2013-01-13 05:09:32",
-        "type": "library",
-        "extra": {
-            "branch-alias": {
-                "dev-master": "3.0-dev"
-            }
-        },
-        "installation-source": "dist",
-        "autoload": {
-            "psr-0": {
-                "Guzzle\\Http": ""
-            }
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "MIT"
-        ],
-        "authors": [
-            {
-                "name": "Michael Dowling",
-                "email": "mtdowling@gmail.com",
-                "homepage": "https://github.com/mtdowling"
-            }
-        ],
-        "description": "HTTP libraries used by Guzzle",
-        "homepage": "http://guzzlephp.org/",
-        "keywords": [
-            "Guzzle",
-            "client",
-            "curl",
-            "http",
-            "http client"
-        ]
-    },
-    {
         "name": "symfony/translation",
         "version": "2.2.x-dev",
         "version_normalized": "2.2.9999999.9999999-dev",
@@ -1510,5 +1309,257 @@
             "database",
             "routing"
         ]
+    },
+    {
+        "name": "guzzle/common",
+        "version": "v3.1.0",
+        "version_normalized": "3.1.0.0",
+        "target-dir": "Guzzle/Common",
+        "source": {
+            "type": "git",
+            "url": "git://github.com/guzzle/common.git",
+            "reference": "v3.1.0"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://github.com/guzzle/common/archive/v3.1.0.zip",
+            "reference": "v3.1.0",
+            "shasum": ""
+        },
+        "require": {
+            "php": ">=5.3.2",
+            "symfony/event-dispatcher": ">=2.1"
+        },
+        "time": "2013-01-13 05:14:34",
+        "type": "library",
+        "extra": {
+            "branch-alias": {
+                "dev-master": "3.0-dev"
+            }
+        },
+        "installation-source": "dist",
+        "autoload": {
+            "psr-0": {
+                "Guzzle\\Common": ""
+            }
+        },
+        "notification-url": "https://packagist.org/downloads/",
+        "license": [
+            "MIT"
+        ],
+        "description": "Common libraries used by Guzzle",
+        "homepage": "http://guzzlephp.org/",
+        "keywords": [
+            "collection",
+            "common",
+            "event",
+            "exception"
+        ]
+    },
+    {
+        "name": "guzzle/stream",
+        "version": "v3.1.0",
+        "version_normalized": "3.1.0.0",
+        "target-dir": "Guzzle/Stream",
+        "source": {
+            "type": "git",
+            "url": "https://github.com/guzzle/stream",
+            "reference": "v3.1.0"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://github.com/guzzle/stream/archive/v3.1.0.zip",
+            "reference": "v3.1.0",
+            "shasum": ""
+        },
+        "require": {
+            "guzzle/common": "self.version",
+            "php": ">=5.3.2"
+        },
+        "time": "2012-12-07 16:45:11",
+        "type": "library",
+        "extra": {
+            "branch-alias": {
+                "dev-master": "3.0-dev"
+            }
+        },
+        "installation-source": "dist",
+        "autoload": {
+            "psr-0": {
+                "Guzzle\\Stream": ""
+            }
+        },
+        "notification-url": "https://packagist.org/downloads/",
+        "license": [
+            "MIT"
+        ],
+        "authors": [
+            {
+                "name": "Michael Dowling",
+                "email": "mtdowling@gmail.com",
+                "homepage": "https://github.com/mtdowling"
+            }
+        ],
+        "description": "Guzzle stream wrapper component",
+        "homepage": "http://guzzlephp.org/",
+        "keywords": [
+            "Guzzle",
+            "component",
+            "stream"
+        ]
+    },
+    {
+        "name": "guzzle/parser",
+        "version": "v3.1.0",
+        "version_normalized": "3.1.0.0",
+        "target-dir": "Guzzle/Parser",
+        "source": {
+            "type": "git",
+            "url": "git://github.com/guzzle/parser.git",
+            "reference": "v3.1.0"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://github.com/guzzle/parser/archive/v3.1.0.zip",
+            "reference": "v3.1.0",
+            "shasum": ""
+        },
+        "require": {
+            "php": ">=5.3.2"
+        },
+        "time": "2013-01-12 21:43:21",
+        "type": "library",
+        "extra": {
+            "branch-alias": {
+                "dev-master": "3.0-dev"
+            }
+        },
+        "installation-source": "dist",
+        "autoload": {
+            "psr-0": {
+                "Guzzle\\Parser": ""
+            }
+        },
+        "notification-url": "https://packagist.org/downloads/",
+        "license": [
+            "MIT"
+        ],
+        "description": "Interchangeable parsers used by Guzzle",
+        "homepage": "http://guzzlephp.org/",
+        "keywords": [
+            "URI Template",
+            "cookie",
+            "http",
+            "message",
+            "url"
+        ]
+    },
+    {
+        "name": "guzzle/http",
+        "version": "v3.1.0",
+        "version_normalized": "3.1.0.0",
+        "target-dir": "Guzzle/Http",
+        "source": {
+            "type": "git",
+            "url": "git://github.com/guzzle/http.git",
+            "reference": "v3.1.0"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://github.com/guzzle/http/archive/v3.1.0.zip",
+            "reference": "v3.1.0",
+            "shasum": ""
+        },
+        "require": {
+            "ext-curl": "*",
+            "guzzle/common": "self.version",
+            "guzzle/parser": "self.version",
+            "guzzle/stream": "self.version",
+            "php": ">=5.3.2"
+        },
+        "time": "2013-01-13 05:09:32",
+        "type": "library",
+        "extra": {
+            "branch-alias": {
+                "dev-master": "3.0-dev"
+            }
+        },
+        "installation-source": "dist",
+        "autoload": {
+            "psr-0": {
+                "Guzzle\\Http": ""
+            }
+        },
+        "notification-url": "https://packagist.org/downloads/",
+        "license": [
+            "MIT"
+        ],
+        "authors": [
+            {
+                "name": "Michael Dowling",
+                "email": "mtdowling@gmail.com",
+                "homepage": "https://github.com/mtdowling"
+            }
+        ],
+        "description": "HTTP libraries used by Guzzle",
+        "homepage": "http://guzzlephp.org/",
+        "keywords": [
+            "Guzzle",
+            "client",
+            "curl",
+            "http",
+            "http client"
+        ]
+    },
+    {
+        "name": "guzzle/plugin-async",
+        "version": "v3.1.0",
+        "version_normalized": "3.1.0.0",
+        "target-dir": "Guzzle/Plugin/Async",
+        "source": {
+            "type": "git",
+            "url": "https://github.com/guzzle/plugin-async",
+            "reference": "v3.0.7"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://github.com/guzzle/plugin-async/archive/v3.0.7.zip",
+            "reference": "v3.0.7",
+            "shasum": ""
+        },
+        "require": {
+            "guzzle/http": "self.version",
+            "php": ">=5.3.2"
+        },
+        "time": "2012-12-07 16:45:11",
+        "type": "library",
+        "extra": {
+            "branch-alias": {
+                "dev-master": "3.0-dev"
+            }
+        },
+        "installation-source": "dist",
+        "autoload": {
+            "psr-0": {
+                "Guzzle\\Plugin\\Async": ""
+            }
+        },
+        "notification-url": "https://packagist.org/downloads/",
+        "license": [
+            "MIT"
+        ],
+        "authors": [
+            {
+                "name": "Michael Dowling",
+                "email": "mtdowling@gmail.com",
+                "homepage": "https://github.com/mtdowling"
+            }
+        ],
+        "description": "Guzzle async request plugin",
+        "homepage": "http://guzzlephp.org/",
+        "keywords": [
+            "Guzzle",
+            "plugin"
+        ]
     }
 ]
diff --git a/core/vendor/guzzle/plugin-async/Guzzle/Plugin/Async/AsyncPlugin.php b/core/vendor/guzzle/plugin-async/Guzzle/Plugin/Async/AsyncPlugin.php
new file mode 100644
index 0000000..7edc664
--- /dev/null
+++ b/core/vendor/guzzle/plugin-async/Guzzle/Plugin/Async/AsyncPlugin.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace Guzzle\Plugin\Async;
+
+use Guzzle\Common\Event;
+use Guzzle\Http\Message\Response;
+use Guzzle\Http\Exception\CurlException;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Sends requests but does not wait for the response
+ */
+class AsyncPlugin implements EventSubscriberInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public static function getSubscribedEvents()
+    {
+        return array(
+            'request.before_send'    => 'onBeforeSend',
+            'request.exception'      => 'onRequestTimeout',
+            'request.sent'           => 'onRequestSent',
+            'curl.callback.progress' => 'onCurlProgress'
+        );
+    }
+
+    /**
+     * Event used to ensure that progress callback are emitted from the curl handle's request mediator.
+     *
+     * @param Event $event
+     */
+    public function onBeforeSend(Event $event)
+    {
+        // Ensure that progress callbacks are dispatched
+        $event['request']->getCurlOptions()->set('progress', true);
+    }
+
+    /**
+     * Event emitted when a curl progress function is called. When the amount of data uploaded == the amount of data to
+     * upload OR any bytes have been downloaded, then time the request out after 1ms because we're done with
+     * transmitting the request, and tell curl not download a body.
+     *
+     * @param Event $event
+     */
+    public function onCurlProgress(Event $event)
+    {
+        if (!$event['handle']) {
+            return;
+        }
+
+        if ($event['downloaded'] || ($event['uploaded'] || $event['upload_size'] === $event['uploaded'])) {
+            $event['handle']->getOptions()
+                ->set(CURLOPT_TIMEOUT_MS, 1)
+                ->set(CURLOPT_NOBODY, true);
+            // Timeout after 1ms
+            curl_setopt($event['handle']->getHandle(), CURLOPT_TIMEOUT_MS, 1);
+            // Even if the response is quick, tell curl not to download the body
+            curl_setopt($event['handle']->getHandle(), CURLOPT_NOBODY, true);
+        }
+    }
+
+    /**
+     * Event emitted when a curl exception occurs. Ignore the exception and set a mock response.
+     *
+     * @param Event $event
+     */
+    public function onRequestTimeout(Event $event)
+    {
+        if ($event['exception'] instanceof CurlException) {
+            $event['request']->setResponse(new Response(200, array(
+                'X-Guzzle-Async' => 'Did not wait for the response'
+            )));
+        }
+    }
+
+    /**
+     * Event emitted when a request completes because it took less than 1ms. Add an X-Guzzle-Async header to notify the
+     * caller that there is no body in the message.
+     *
+     * @param Event $event
+     */
+    public function onRequestSent(Event $event)
+    {
+        // Let the caller know this was meant to be async
+        $event['request']->getResponse()->setHeader('X-Guzzle-Async', 'Did not wait for the response');
+    }
+}
diff --git a/core/vendor/guzzle/plugin-async/Guzzle/Plugin/Async/composer.json b/core/vendor/guzzle/plugin-async/Guzzle/Plugin/Async/composer.json
new file mode 100644
index 0000000..12cd529
--- /dev/null
+++ b/core/vendor/guzzle/plugin-async/Guzzle/Plugin/Async/composer.json
@@ -0,0 +1,27 @@
+{
+    "name": "guzzle/plugin-async",
+    "description": "Guzzle async request plugin",
+    "homepage": "http://guzzlephp.org/",
+    "keywords": ["plugin", "guzzle"],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Michael Dowling",
+            "email": "mtdowling@gmail.com",
+            "homepage": "https://github.com/mtdowling"
+        }
+    ],
+    "require": {
+        "php": ">=5.3.2",
+        "guzzle/http": "self.version"
+    },
+    "autoload": {
+        "psr-0": { "Guzzle\\Plugin\\Async": "" }
+    },
+    "target-dir": "Guzzle/Plugin/Async",
+    "extra": {
+        "branch-alias": {
+            "dev-master": "3.0-dev"
+        }
+    }
+}