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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="dns-prefetch" href="//www.robgravelle.com/">
...
“The recommended best practice is to have your prefetch requests queued to the client OS as early as possible. It is also preferred to have them received in the first packet of the HTML. Therefore, explicit prefetch links should be placed immediately after the “meta charset” tag:”
<meta http-equiv="x-dns-prefetch-control" content="off">