Preconnect, Prefetch, Prerender ...
A very informative and interesting presentation about browsing performance, looking at efforts Google Chrome takes to increase it.
From those slides
There is a bunch of interesting pages in Chrome:
- chrome://dns - List of prefetched DNS
- chrome://predictors/ - Chrome knows where you'll go
Preconnect
With <link rel="preconnect" href="https://the-domain.com">
in an HTML head, you give the browser an early hint that it will need to access the mentioned domain. By setting up the connection in advance, page load performance gets improved.