mabujo

Modern browsers allow pages to prefetch DNS records of external libraries. This plugin looks through WordPress enqueued scripts and styles and adds DNS prefetch statements for scripts and stylesheets added by other plugins.
This means that when the browser comes to download an external script or stylesheet, it already has looked up the DNS record for the external domain, and can proceed immediately to downloading the script, saving latency during loading of external resources.
You can read more about this technique in the <a href="https://www.chromium.org/developers/design-documents/dns-prefetching" rel="nofollow ugc">Chromium document</a>.
Plugin page <a href="https://mabujo.com/blog/automatic-dns-prefetch-wordpress-plugin/" rel="nofollow ugc">Automatic DNS Prefetch plugin @ mabujo</a>.

Automatic DNS Prefetch

Works as advertised

This plugin speeds up your page load speed by adding DNS prefetch statements for external libraries.

Stanislav Khromov

titanas

Instant Articles for WordPress will let you configure DNS prefetching URLs and will automatically prerender the last 2 posts on the front page, plus next and previous posts when viewing a single post. You also have the option to pre-render sticky posts.
It is not recommended to use more than 4-5 URLs for DNS prefetching.
Enabling page prerendering will likely increase server and client (browsers) load.
Enabling subresources will let you specify URL’s to hint the web browser for high priority files, likes .JS or .CSS, for fetching these even before they appear in the HTML document.
Visit the Instant Articles homepage for more info: http://wpinstant.io/
Usage
Basic usage
Install plugin, go to the WP Admin > Instant Articles screen and enable the features you want.
<h3>Requirements</h3>
<ul>
<li>PHP version 5.2.4 or greater</li>
</ul>
<h3>Translations</h3>
<ul>
<li>None</li>
</ul>

WordPress Instant Articles

WordPress Instant Articles dramatically improves user experience and site speed with page pre-render, DNS prefetch, Link Prefetch, HTML5 subresource

Automatic DNS Prefetch vs WordPress Instant Articles