Enhance your WordPress performance by disabling wp-cron.php

<?php
/**
* WordPress Cron Implementation for hosts, which do not offer CRON or for which
* the user has not set up a CRON job pointing to this file.
*
* The HTTP request to this file will not slow down the visitor who happens to
* visit when the cron job is needed to run.
*
* @package WordPress
*/

ignore_user_abort(true);

if ( !empty($_POST) || defined('DOING_AJAX') || defined('DOING_CRON') )
die();

/**
* Tell WordPress we are doing the CRON task.
*
* @var bool
*/
define('DOING_CRON', true);

if ( !defined('ABSPATH') ) {
/** Set up WordPress environment */
require_once( dirname( __FILE__ ) . '/wp-load.php' );
}

/**
* Retrieves the cron lock.
*
* Returns the uncached `doing_cron` transient.
*
* @ignore
* @since 3.3.0
*
* @return string|false Value of the `doing_cron` transient, 0|false otherwise.
*/
function _get_cron_lock() {
global $wpdb;

$value = 0;
if ( wp_using_ext_object_cache() ) {
/*
* Skip local cache and force re-fetch of doing_cron transient
* in case another process updated the cache.
*/
$value = wp_cache_get( 'doing_cron', 'transient', true );
} else {
$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) );
if ( is_object( $row ) )
$value = $row->option_value;
}

return $value;
}

if ( false === $crons = _get_cron_array() )
die();

$keys = array_keys( $crons );
$gmt_time = microtime( true );

if ( isset($keys[0]) && $keys[0] > $gmt_time )
die();


// The cron lock: a unix timestamp from when the cron was spawned.
$doing_cron_transient = get_transient( 'doing_cron' );

// Use global $doing_wp_cron lock otherwise use the GET lock. If no lock, trying grabbing a new lock.
if ( empty( $doing_wp_cron ) ) {
if ( empty( $_GET[ 'doing_wp_cron' ] ) ) {
// Called from external script/job. Try setting a lock.
if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) )
return;
$doing_cron_transient = $doing_wp_cron = sprintf( '%.22F', microtime( true ) );
set_transient( 'doing_cron', $doing_wp_cron );
} else {
$doing_wp_cron = $_GET[ 'doing_wp_cron' ];
}
}

/*
* The cron lock (a unix timestamp set when the cron was spawned),
* must match $doing_wp_cron (the "key").
*/
if ( $doing_cron_transient != $doing_wp_cron )
return;

foreach ( $crons as $timestamp => $cronhooks ) {
if ( $timestamp > $gmt_time )
break;

foreach ( $cronhooks as $hook => $keys ) {

foreach ( $keys as $k => $v ) {

$schedule = $v['schedule'];

if ( $schedule != false ) {
$new_args = array($timestamp, $schedule, $hook, $v['args']);
call_user_func_array('wp_reschedule_event', $new_args);
}

wp_unschedule_event( $timestamp, $hook, $v['args'] );

/**
* Fires scheduled events.
*
* @ignore
* @since 2.1.0
*
* @param string $hook Name of the hook that was scheduled to be fired.
* @param array $args The arguments to be passed to the hook.
*/
do_action_ref_array( $hook, $v['args'] );

// If the hook ran too long and another cron process stole the lock, quit.
if ( _get_cron_lock() != $doing_wp_cron )
return;
}
}
}

if ( _get_cron_lock() == $doing_wp_cron )
delete_transient( 'doing_cron' );

die();