jp2112

This plugin implements DNS prefetching per the Mozilla specification for the Firefox browser. Hopefully, other browsers will eventually support DNS prefetching.
See https://developer.mozilla.org/en-US/docs/Controlling_DNS_prefetching for more detail.
Disclaimer: This plugin is not affiliated with or endorsed by Mozilla.
<h3>If you need help with this plugin</h3>
If this plugin breaks your site or just flat out does not work, create a thread in the <a href="https://wordpress.org/support/plugin/dns-prefetch" rel="ugc">Support</a> forum with a description of the issue. Make sure you are using the latest version of WordPress and the plugin before reporting issues, to be sure that the issue is with the current version and not with an older version where the issue may have already been fixed.
Please do not use the <a href="https://wordpress.org/support/view/plugin-reviews/dns-prefetch" rel="ugc">Reviews</a> section to report issues or request new features.

DNS Prefetch

Adds dns prefetching meta tags to your site.

andrewmoof

DNS resolution time can lead to a significant amount of user perceived latency. The time that DNS resolution takes is highly variable. Latency delays range from around 1ms (locally cached results) to commonly reported times of several seconds.
DNS prefetching is an attempt to resolve domain names before a user tries to follow a link. This is done using the computer’s normal DNS resolution mechanism. Once a domain name has been resolved, if the user does navigate to that domain, there will be no effective delay due to DNS resolution time. When we encounter hyperlinks in pages, we extract the domain name from each one and resolving each domain to an IP address. All this work is done in parallel with the user’s reading of the page, using minimal CPU and network resources. When a user clicks on any of these pre-resolved names, they will on average save about 200 milliseconds in their navigation (assuming the user hadn’t already visited the domain recently). More importantly than the average savings, users won’t tend to experience the “worst case” delays for DNS resolution, which are regularly over 1 second.

Simple DNS Prefetch

Adds (or removes) DNS prefetching meta tags to your site and speeds up your page load speed.

DNS Prefetch vs Simple DNS Prefetch