To get the content of an HTML page up as soon as possible put <script/> tags after content to avoid delaying the rendering until after the script loads. Possibly even after the <body/>.
<body>
<div>display content before loading script...</div>
<script src="http://o.aolcdn.com/dojo/1.5/dojo/dojo.xd.js.uncompressed.js"></script>
</body>
A script loader does the same thing (LABjs):
<head>
<script src="scripts/lab.js" type="text/javascript"></script><script type="text/javascript">
$LAB
.script("http://o.aolcdn.com/dojo/1.5/dojo/dojo.xd.js.uncompressed.js");
</script>
</head>
<body>
<div>display content before loading script...</div>
</body>
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