Index: wp-includes/class-wp-editor.php
===================================================================
--- wp-includes/class-wp-editor.php	(revision 39161)
+++ wp-includes/class-wp-editor.php	(working copy)
@@ -1355,6 +1355,7 @@
 			'update_post_meta_cache' => false,
 			'post_status' => 'publish',
 			'posts_per_page' => 20,
+			'no_found_rows' => true,
 		);
 
 		$args['pagenum'] = isset( $args['pagenum'] ) ? absint( $args['pagenum'] ) : 1;