Load using wp_head with highest priority

This is a great plugin and highly useful for sites.

One thing that would be great is if you loaded the domains to be prefetched before any scripts are loaded from them. Add a priority number for the hook you use into wp_head.

On line 120 of the dns-prefetch.php file, change
add_action('wp_head', 'dpf_prefetch');

to
add_action('wp_head', 'dpf_prefetch',0);

This way the DNS is prefetched as one of the first things loaded when calling wp_head.

Thanks.

https://www.ads-software.com/plugins/dns-prefetch/