Issue #3389839: Mark some more tests #slow

core/modules/ckeditor5/tests/src/Functional/Update/CKEditor5UpdateImageToolbarItemTest.php

@@ -16,6 +16,7 @@
  * Tests the update path for the CKEditor 5 image toolbar item.
  *
  * @group Update
+ * @group #slow
  */
 class CKEditor5UpdateImageToolbarItemTest extends UpdatePathTestBase {