diff --git a/core/lib/Drupal/Core/DependencyInjection/Container.php b/core/lib/Drupal/Core/DependencyInjection/Container.php
index 4ac3c65..516d1c2 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Container.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Container.php
@@ -7,7 +7,6 @@
 
 namespace Drupal\Core\DependencyInjection;
 
-use \ReflectionClass;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\IntrospectableContainerInterface;
 use Symfony\Component\DependencyInjection\ScopeInterface;
@@ -215,7 +214,7 @@ public function get($id, $invalidBehavior = ContainerInterface::EXCEPTION_ON_INV
    * @return object
    *   The service described by the service definition.
    *
-   * @throws Symfony\Component\DependencyInjection\Exception\RuntimeException\RuntimeExceptio
+   * @throws Symfony\Component\DependencyInjection\Exception\RuntimeException\RuntimeException
    *   Thrown when the service is a synthetic service.
    * @throws Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
    *   Thrown when the configurator callable is not callable.
@@ -291,7 +290,7 @@ protected function createService($definition, $id) {
           $service = new $class($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4], $arguments[5], $arguments[6], $arguments[7], $arguments[8], $arguments[9]);
           break;
         default:
-          $r = new ReflectionClass($class);
+          $r = new \ReflectionClass($class);
           $service = $r->newInstanceArgs($arguments);
           break;
       }
diff --git a/core/lib/Drupal/Core/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php b/core/lib/Drupal/Core/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
index 998c208..df9fccd 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
@@ -38,6 +38,10 @@ class OptimizedPhpArrayDumper extends Dumper {
   /**
    * Whether to serialize service definitions or not.
    *
+   * Service definitions are serialized by default to avoid having to
+   * unserialize the whole container on loading time, which improves early
+   * bootstrap performance for e.g. the page cache.
+   *
    * @var bool
    */
    protected $serialize = TRUE;
diff --git a/core/lib/Drupal/Core/DependencyInjection/PhpArrayContainer.php b/core/lib/Drupal/Core/DependencyInjection/PhpArrayContainer.php
index e939f4d..694098b 100644
--- a/core/lib/Drupal/Core/DependencyInjection/PhpArrayContainer.php
+++ b/core/lib/Drupal/Core/DependencyInjection/PhpArrayContainer.php
@@ -145,14 +145,7 @@ protected function createService($definition, $id) {
           $arguments = $call[1];
           $arguments = $this->resolveServicesAndParameters($arguments);
         }
-        // Only use the slow call_user_func_array() when there actually are
-        // arguments.
-        if (!$arguments) {
-          $service->{$method}();
-        }
-        else {
-          call_user_func_array(array($service, $method), $arguments);
-        }
+        call_user_func_array(array($service, $method), $arguments);
       }
     }
 
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 4607f28..7fc8399 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -802,16 +802,7 @@ protected function initializeContainer() {
     // If the module list hasn't already been set in updateModules and we are
     // not forcing a rebuild, then try and load the container from the disk.
     if (empty($this->moduleList) && !$this->containerNeedsRebuild) {
-      try {
-        $cache = $this->bootstrapContainer->get('cache.container')->get($this->getContainerCacheKey());
-      } catch (\Exception $e) {
-        // In the InstallerKernel the database is not available at this point.
-        // Not being able to load from cache is not a fatal condition, hence
-        // the error is ignored here.
-        // If the database is really not available, then it will fatal during
-        // service construction.
-        $cache = FALSE;
-      }
+      $cache = $this->bootstrapContainer->get('cache.container')->get($this->getContainerCacheKey());
       if ($cache) {
         $container_definition = $cache->data;
       }