The CoreMetrics analytics library can be asychronously loaded; their knowledge base provides an example implementation that may not function as intended if it is used exactly as written:
<body>
<script type='text/javascript'>
var cmTagQueue = cmTagQueue || [];
cmTagQueue.push(['cmSetClientID', '99999999', false, "testdata.coremetrics.com", "mysite.com"]);
cmTagQueue.push(['cmCreatePageviewTag','AsyncTestPageID','AsyncTestPageID']);