Index: wp-includes/update.php
===================================================================
--- wp-includes/update.php	(revision 15130)
+++ wp-includes/update.php	(working copy)
@@ -327,19 +327,22 @@
 	wp_update_themes();
 }
 
-add_action( 'admin_init', '_maybe_update_core' );
+if ( !defined( 'DOING_AJAX' ) || !DOING_AJAX  ) {
+	add_action( 'admin_init', '_maybe_update_core' );
+	add_action( 'admin_init', '_maybe_update_plugins' );
+	add_action( 'admin_init', '_maybe_update_themes' );
+}
+
 add_action( 'wp_version_check', 'wp_version_check' );
 
 add_action( 'load-plugins.php', 'wp_update_plugins' );
 add_action( 'load-update.php', 'wp_update_plugins' );
 add_action( 'load-update-core.php', 'wp_update_plugins' );
-add_action( 'admin_init', '_maybe_update_plugins' );
 add_action( 'wp_update_plugins', 'wp_update_plugins' );
 
 add_action( 'load-themes.php', 'wp_update_themes' );
 add_action( 'load-update.php', 'wp_update_themes' );
 add_action( 'load-update-core.php', 'wp_update_themes' );
-add_action( 'admin_init', '_maybe_update_themes' );
 add_action( 'wp_update_themes', 'wp_update_themes' );
 
 if ( !wp_next_scheduled('wp_version_check') && !defined('WP_INSTALLING') )