Using Google CDN to load jQuery, with a local WordPress fallback?

Hi,

I’m considering if it’s worth while, dequeuing WordPress’ jQuery for Google CDN jQuery, being a faster load?

Possible checking on the current WordPress version:

$jquery_version = $GLOBALS['wp_scripts']->registered['jquery']->ver;

wp_enqueue_script('jquery','https://ajax.googleapis.com/ajax/libs/jquery/' . $jquery_version . '/jquery.min.js'

I would probably need to check to make sure Google’s library is available?

Under the theme function would it be best to check/replace?

Also, only do it if not admin?

Something like…

//jQuery Insert From Google
if (!is_admin()) add_action("wp_enqueue_scripts", "my_jquery_enqueue", 11);
function my_jquery_enqueue() {
$jquery_version = $GLOBALS['wp_scripts']->registered['jquery']->ver;
   wp_deregister_script('jquery');
   wp_register_script('jquery', "http" . ($_SERVER['SERVER_PORT'] == 443 ? "s" : "") . "://ajax.googleapis.com/ajax/libs/jquery" . $jquery_version . "/jquery.min.js", false, null);
   wp_enqueue_script('jquery');
}

Is it worth checking the URL is available first, as that would be a lot of pinging? Or is it better to just manually update the version each WordPress upgrade?

Would I also need to do ‘jquery-migrate.min.js’ too?