diff --git a/core/modules/file/tests/src/Functional/FileListingTest.php b/core/modules/file/tests/src/Functional/FileListingTest.php
index 332a9c3bce44535430935705dbb69dd6b459d6fa..740505df96999954c768a926315600e742d62aa0 100644
--- a/core/modules/file/tests/src/Functional/FileListingTest.php
+++ b/core/modules/file/tests/src/Functional/FileListingTest.php
@@ -13,6 +13,7 @@
  * Tests file listing page functionality.
  *
  * @group file
+ * @group #slow
  */
 class FileListingTest extends FileFieldTestBase {
 
diff --git a/core/modules/shortcut/tests/src/Functional/ShortcutSetsTest.php b/core/modules/shortcut/tests/src/Functional/ShortcutSetsTest.php
index e426d8fffbe92f85e90e66d2b3cddd0a8bc736d5..6cd6d84660e92cedd3482e1d1d5f922e9b6ecf03 100644
--- a/core/modules/shortcut/tests/src/Functional/ShortcutSetsTest.php
+++ b/core/modules/shortcut/tests/src/Functional/ShortcutSetsTest.php
@@ -10,6 +10,7 @@
  * Create, view, edit, delete, and change shortcut sets.
  *
  * @group shortcut
+ * @group #slow
  */
 class ShortcutSetsTest extends ShortcutTestBase {
 
diff --git a/core/modules/system/tests/src/Functional/Batch/ProcessingTest.php b/core/modules/system/tests/src/Functional/Batch/ProcessingTest.php
index 29786931d9255a862f7b4658bae17161aa4b7b84..283ce54082eb3473b453424c74dfe3dd7fac3723 100644
--- a/core/modules/system/tests/src/Functional/Batch/ProcessingTest.php
+++ b/core/modules/system/tests/src/Functional/Batch/ProcessingTest.php
@@ -11,6 +11,7 @@
  * Tests batch processing in form and non-form workflow.
  *
  * @group Batch
+ * @group #slow
  */
 class ProcessingTest extends BrowserTestBase {