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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);
@PraneethKarnena

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PraneethKarnena commented Dec 24, 2016

This function do exist in W3 Total Cache CDN tab.

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