This plugin modify the url of the images to speed up the page browsing.
We need to determine the subdomain pattern (ex: http://cdn-#.domain.tld ) substitution and the maximum number of subdomains we want to work with (ex: 5).
The pattern will transform an url like this 'http://www.domain.tld/img/source1.jpg' to this new url structure 'http://cdn-X.domain.tld/img/source1.jpg' where X ranges from 1 to 5 (max).
NOTE: If you have trouble accessing images using the new address because WordPress asks you to register the domain then you must insert the following line in the file wp-config.php
Then you need to be sure to set write permissions to the aliases folder located within the plugin directory.
NOTE: You'll need to manually create the new A records for the subdomains in your DNS panel. They should have the same ip address of your main domain.
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