Performance fixes

css/archive_tree.css

@@ -7,7 +7,7 @@
   padding-bottom: 0;
 }
 .archive-tree-year {
-  font-weight: bold;
+  font-weight: normal;
 }
 .archive-tree-month {
   margin-left: 2em;

src/Plugin/Block/ArchiveTreeBlock.php

@@ -72,17 +72,24 @@ class ArchiveTreeBlock extends BlockBase {
         '#markup' => $this->t('No content types selected.'),
       ];
     }
+    // 1. Get node IDs with access check.
     $query = $storage->getQuery()
       ->condition('type', $types, 'IN')
       ->condition('status', 1)
       ->sort('created', 'DESC')
       ->accessCheck(TRUE);
     $nids = $query->execute();
-    $nodes = $storage->loadMultiple($nids);
 
     $tree = [];
-    foreach ($nodes as $node) {
+    if (!empty($nids)) {
-      $created = $node->getCreatedTime();
+      // 2. Fetch only nid and created fields for those nodes.
+      $connection = \Drupal::database();
+      $result = $connection->select('node_field_data', 'n')
+        ->fields('n', ['nid', 'created'])
+        ->condition('n.nid', $nids, 'IN')
+        ->execute();
+      foreach ($result as $row) {
+        $created = $row->created;
         $year = date('Y', $created);
         $month = date('m', $created);
         if (!isset($tree[$year])) {
@@ -94,6 +101,7 @@ class ArchiveTreeBlock extends BlockBase {
         $tree[$year]['count']++;
         $tree[$year]['months'][$month]['count']++;
       }
+    }
 
     krsort($tree); // Descending years
     foreach ($tree as $year => $data) {