--- a/src/Plugin/facets/hierarchy/Taxonomy.php	2026-05-26 12:38:32.318690849 +0200
+++ b/src/Plugin/facets/hierarchy/Taxonomy.php	2026-05-26 12:38:46.819954029 +0200
@@ -125,14 +125,23 @@
    * {@inheritdoc}
    */
   public function getChildIds(array $ids) {
+    if (empty($ids)) {
+      return [];
+    }
+    $query = \Drupal::database()->select('taxonomy_term_field_data', 'td');
+    $query->join('taxonomy_term__parent', 'th', '[td].[tid] = [th].[entity_id]');
+    $query->addField('td', 'tid');
+    $query->addField('th', 'parent_target_id');
+    $query->condition('[th].[parent_target_id]', $ids, 'IN');
+    $query->condition('[td].[default_langcode]', 1);
+    $query->orderBy('[td].[weight]');
+    $query->orderBy('[td].[name]');
+    $rows = $query->execute()->fetchAll();
+
     $parents = [];
-    foreach ($ids as $id) {
-      $terms = $this->getTermStorage()->loadChildren($id);
-      $parents[$id] = array_filter(array_values(array_map(function ($it) {
-        return $it->id();
-      }, $terms)));
+    foreach ($rows as $row) {
+      $parents[$row->parent_target_id][] = (int) $row->tid;
     }
-    $parents = array_filter($parents);
     return $parents;
   }