At my location, each prefetched DNS record saves about 240ms of load time. Therefore, UI Drafter's pages prefetch domain names users may go next. It can be done in two ways:
Option 1: <link> tag
<head> <link rel="dns-prefetch" href="//docs.uidrafter.com">
Option 2: Link response header
Link: <//docs.uidrafter.com>; rel="dns-prefetch"