Ticket #21120: 21120.2.patch

wp-includes/pluggable.php

@@ -138 +138 @@
         if ( !$userdata )
                 return false;
 
+        $user = wp_cache_get( $userdata->ID, 'users' );
+
+        if ( !empty( $user ) && !empty( $user->caps ) )
+                return $user;
+
         $user = new WP_User;
         $user->init( $userdata );
 
+        wp_cache_set( $userdata->ID, $user, 'users' );
         return $user;
 }
 endif;