diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index d7d0e16d56115..f7c55ce3f4b27 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -361,6 +361,11 @@ public function load(array $configs, ContainerBuilder $container)
         $container->registerForAutoconfiguration(ObjectInitializerInterface::class)
             ->addTag('validator.initializer');
 
+        if (!$container->getParameter('kernel.debug')) {
+            // remove tagged iterator argument for resource checkers
+            $container->getDefinition('config_cache_factory')->setArguments(array());
+        }
+
         if (\PHP_VERSION_ID < 70000) {
             $this->addClassesToCompile(array(
                 'Symfony\\Component\\Config\\ConfigCache',
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
index 31f34c9859e12..8b2841dc9ab60 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
@@ -988,6 +988,17 @@ public function testCachePoolServices()
         $this->assertCachePoolServiceDefinitionIsCreated($container, 'cache.def', 'cache.app', 11);
     }
 
+    public function testRemovesResourceCheckerConfigCacheFactoryArgumentOnlyIfNoDebug()
+    {
+        $container = $this->createContainer(array('kernel.debug' => true));
+        (new FrameworkExtension())->load(array(), $container);
+        $this->assertCount(1, $container->getDefinition('config_cache_factory')->getArguments());
+
+        $container = $this->createContainer(array('kernel.debug' => false));
+        (new FrameworkExtension())->load(array(), $container);
+        $this->assertEmpty($container->getDefinition('config_cache_factory')->getArguments());
+    }
+
     protected function createContainer(array $data = array())
     {
         return new ContainerBuilder(new ParameterBag(array_merge(array(
diff --git a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
index ab8c99eeadaa5..d2c5eff24703a 100644
--- a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
+++ b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
@@ -68,7 +68,11 @@ public function isFresh()
             return false;
         }
 
-        if (!$this->resourceCheckers) {
+        if ($this->resourceCheckers instanceof \Traversable && !$this->resourceCheckers instanceof \Countable) {
+            $this->resourceCheckers = iterator_to_array($this->resourceCheckers);
+        }
+
+        if (!count($this->resourceCheckers)) {
             return true; // shortcut - if we don't have any checkers we don't need to bother with the meta file at all
         }
 
diff --git a/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php b/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
index d39742ad88f8c..371c7baa1cc7d 100644
--- a/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
+++ b/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
@@ -57,7 +57,7 @@ public function testCacheIsNotFreshIfEmpty()
         $this->assertFalse($cache->isFresh());
     }
 
-    public function testCacheIsFreshIfNocheckerProvided()
+    public function testCacheIsFreshIfNoCheckerProvided()
     {
         /* For example in prod mode, you may choose not to run any checkers
            at all. In that case, the cache should always be considered fresh. */
@@ -65,6 +65,12 @@ public function testCacheIsFreshIfNocheckerProvided()
         $this->assertTrue($cache->isFresh());
     }
 
+    public function testCacheIsFreshIfEmptyCheckerIteratorProvided()
+    {
+        $cache = new ResourceCheckerConfigCache($this->cacheFile, new \ArrayIterator(array()));
+        $this->assertTrue($cache->isFresh());
+    }
+
     public function testResourcesWithoutcheckersAreIgnoredAndConsideredFresh()
     {
         /* As in the previous test, but this time we have a resource. */