Stefan M.

The Plugin implements 2 things:
DNS-Prefetch
It looks for all CSS and JS Files which are loaded from external webpages and implement a dns-prefetch header tag. 
This saves a lot of connection time on page load.
HTML5 Prefetch and Google Prerender
It makes a new table with small statistics and measures (internal) referal page to next page. 
With these statistics, the most clicked “next” page will be automatically added as prerender. Prerender opens with very small CPU load the “next” guessed page already as a hidden Tab in the client browser. If the client select this page, the page can instantly showed without delay. 
Tests have shown a pageload decrease of 68%.
Please note: The prerender needs some stats to work correctly. Don’t try to generate some statistic, wait few days / weeks and you have organic and true statistic.
If you have questions, please do not hesitate to contact us: <a href="http://wuk.ch/" title="web updates kmu GmbH" rel="nofollow ugc">wuk.ch</a>

wuk.ch DNS-Prefetch / Prerender

Adds dns-prefetch and prerender functionalities on WordPress for better PageSpeed.

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.

wuk.ch DNS-Prefetch / Prerender vs Simple DNS Prefetch