diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index 51ade6c..7deb664 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -55,6 +55,11 @@ class Config extends StorableConfigBase {
   protected $settingsOverrides;
 
   /**
+   * @var bool
+   */
+  protected $trustedData = FALSE;
+
+  /**
    * Constructs a configuration object.
    *
    * @param string $name
@@ -209,16 +214,18 @@ public function save() {
 
     // If there is a schema for this configuration object, cast all values to
     // conform to the schema.
-    if ($this->typedConfigManager->hasConfigSchema($this->name)) {
-      // Ensure that the schema wrapper has the latest data.
-      $this->schemaWrapper = NULL;
-      foreach ($this->data as $key => $value) {
-        $this->data[$key] = $this->castValue($key, $value);
+    if (!$this->trustedData) {
+      if ($this->typedConfigManager->hasConfigSchema($this->name)) {
+        // Ensure that the schema wrapper has the latest data.
+        $this->schemaWrapper = NULL;
+        foreach ($this->data as $key => $value) {
+          $this->data[$key] = $this->castValue($key, $value);
+        }
       }
-    }
-    else {
-      foreach ($this->data as $key => $value) {
-        $this->validateValue($key, $value);
+      else {
+        foreach ($this->data as $key => $value) {
+          $this->validateValue($key, $value);
+        }
       }
     }
 
@@ -229,6 +236,7 @@ public function save() {
     $this->isNew = FALSE;
     $this->eventDispatcher->dispatch(ConfigEvents::SAVE, new ConfigCrudEvent($this));
     $this->originalData = $this->data;
+    $this->trustedData = FALSE;
     return $this;
   }
 
@@ -302,4 +310,17 @@ public function getOriginal($key = '', $apply_overrides = TRUE) {
       }
     }
   }
+
+  /**
+   * Indicates that the configuration data is trusted.
+   *
+   * If the configuration data is trusted then we don't need to check schema on
+   * save.
+   *
+   * @return $this
+   */
+  public function setTrustedData() {
+    $this->trustedData = TRUE;
+    return $this;
+  }
 }
diff --git a/core/lib/Drupal/Core/Config/ConfigInstaller.php b/core/lib/Drupal/Core/Config/ConfigInstaller.php
index 8065613..042bf82 100644
--- a/core/lib/Drupal/Core/Config/ConfigInstaller.php
+++ b/core/lib/Drupal/Core/Config/ConfigInstaller.php
@@ -233,11 +233,11 @@ protected function createConfiguration($collection, array $config_to_install) {
           $entity = $entity_storage->createFromStorageRecord($new_config->get());
         }
         if ($entity->isInstallable()) {
-          $entity->save();
+          $entity->setTrustedData()->save();
         }
       }
       else {
-        $new_config->save();
+        $new_config->setTrustedData()->save();
       }
     }
   }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
index ec09fd5..13190ba 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
@@ -95,6 +95,8 @@
    */
   protected $third_party_settings = array();
 
+  protected $trustedData = FALSE;
+
   /**
    * Overrides Entity::__construct().
    */
@@ -314,7 +316,7 @@ public function preSave(EntityStorageInterface $storage) {
         throw new ConfigDuplicateUUIDException(String::format('Attempt to save a configuration entity %id with UUID %uuid when this entity already exists with UUID %original_uuid', array('%id' => $this->id(), '%uuid' => $this->uuid(), '%original_uuid' => $original->uuid())));
       }
     }
-    if (!$this->isSyncing()) {
+    if (!$this->isSyncing() && !$this->trustedData) {
       // Ensure the correct dependencies are present. If the configuration is
       // being written during a configuration synchronization then there is no
       // need to recalculate the dependencies.
@@ -524,4 +526,28 @@ public function isInstallable() {
     return TRUE;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function setTrustedData() {
+    $this->trustedData = TRUE;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTrustedData() {
+    return $this->trustedData;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save() {
+    $return = parent::save();
+    $this->setTrustedData(FALSE);
+    return $return;
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php
index a434ac1..8ce74bf 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php
@@ -203,4 +203,21 @@ public function getDependencies();
    */
   public function isInstallable();
 
+  /**
+   * Sets that the data should be trusted.
+   * @param bool $trust
+   *   TRUE if the configuration data is trusted, FALSE if not.
+   *
+   * @return $this
+   */
+  public function setTrustedData();
+
+  /**
+   * Gets whether on not the data is trusted.
+   *
+   * @return bool
+   *   TRUE if the configuration data is trusted, FALSE if not.
+   */
+  public function getTrustedData();
+
 }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php
index 1527ac6..cdf2f87 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php
@@ -256,7 +256,7 @@ protected function doSave($id, EntityInterface $entity) {
 
     // Retrieve the desired properties and set them in config.
     $config->setData($this->mapToStorageRecord($entity));
-    $config->save();
+    $config->setTrustedData($entity->getTrustedData())->save();
 
     return $is_new ? SAVED_NEW : SAVED_UPDATED;
   }