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diff --git a/web/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php b/web/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
index 48341492b..dd4ae5f47 100644
--- a/web/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
+++ b/web/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
@@ -59,6 +59,9 @@ class InstallerServiceProvider implements ServiceProviderInterface, ServiceModif
       // The core router builder, but there is no reason here to be lazy, so
       // we don't need to ship with a custom proxy class.
       ->setLazy(FALSE);
+
+    // Use a performance optimised module extension list.
+    $container->getDefinition('extension.list.module')->setClass('Drupal\Core\Installer\InstallerModuleExtensionList');
   }
 
   /**