diff --git a/core/modules/history/history.module b/core/modules/history/history.module
index f42159a..5f35aee 100644
--- a/core/modules/history/history.module
+++ b/core/modules/history/history.module
@@ -30,7 +30,8 @@
  *   of when the last view occurred; otherwise, zero.
  */
 function history_read($nid) {
-  return history_read_multiple(array($nid));
+  $history = history_read_multiple(array($nid));
+  return $history[$nid];
 }
 
 /**
@@ -69,7 +70,7 @@ function history_read_multiple($nids) {
     ':nids' => array_keys($nodes_to_read),
   ));
   foreach ($result as $row) {
-    $nodes_to_read[$row->nid] = $row->timestamp;
+    $nodes_to_read[$row->nid] = (int)$row->timestamp;
   }
   $history += $nodes_to_read;
 
@@ -100,7 +101,10 @@ function history_write($nid, $account = NULL) {
       ))
       ->fields(array('timestamp' => REQUEST_TIME))
       ->execute();
-   }
+    // Update static cache.
+    $history = &drupal_static('history_read', array());
+    $history[$nid] = REQUEST_TIME;
+  }
 }
 
 /**
diff --git a/core/modules/history/lib/Drupal/history/Controller/HistoryController.php b/core/modules/history/lib/Drupal/history/Controller/HistoryController.php
index 86c4aa0..b605e6e 100644
--- a/core/modules/history/lib/Drupal/history/Controller/HistoryController.php
+++ b/core/modules/history/lib/Drupal/history/Controller/HistoryController.php
@@ -37,12 +37,7 @@ public function getNodeReadTimestamps(Request $request) {
     if (!isset($nids)) {
       throw new NotFoundHttpException();
     }
-
-    $timestamps = array();
-    foreach ($nids as $nid) {
-      $timestamps[$nid] = (int) history_read($nid);
-    }
-    return new JsonResponse($timestamps);
+    return new JsonResponse(history_read_multiple($nids));
   }
 
   /**