Parallelize downloads across hostnames for WordPress. Useful to boost static resources load speed on websites. Recommended by GTmetrix, Pingdom, Google Speed Insights, and others.
<?php | |
/****** | |
Parallelize downloads across hostnames for WordPress. | |
Useful to boost static resources load speed on websites. | |
Recommended by GTmetrix, Pingdom, Google Speed Insights, and others. | |
See full post > https://medium.com/p/32e9dc2fec0c | |
In order to work properly, all subdomains/hostnames MUST have the same structure/path. Ex: | |
http://mydomain.com/wp-content/uploads/2015/11/myimage.jpg | |
http://media1.mydomain.com/wp-content/uploads/2015/11/myimage.jpg | |
http://media2.mydomain.com/wp-content/uploads/2015/11/myimage.jpg | |
Add to functions.php | |
******/ | |
function parallelize_hostnames($url, $id) { | |
$hostname = par_get_hostname($url); //call supplemental function | |
$url = str_replace(parse_url(get_bloginfo('url'), PHP_URL_HOST), $hostname, $url); | |
return $url; | |
} | |
function par_get_hostname($name) { | |
$subdomains = array('media1.mydomain.com','media2.mydomain.com'); //add your subdomains here, as many as you want. | |
$host = abs(crc32(basename($name)) % count($subdomains)); | |
$hostname = $subdomains[$host]; | |
return $hostname; | |
} | |
add_filter('wp_get_attachment_url', 'parallelize_hostnames', 10, 2); |
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This function do exist in W3 Total Cache CDN tab.