document.write vs async script loads

JavaScript performance comparison

Revision 3 of this test case created

Preparation code

<iframe id="head" style="display: none"></iframe>
 
<script>
Benchmark.prototype.setup = function() {
    var s, head = document.getElementById("head");
    doc = (head.contentWindow.document || head.contentDocument.document);
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
appendChild
s=document.createElement('script');
s.src='javascript:void(0)';
head.appendChild(s);
pending…
document.write
doc.write('<script src="javascript:void(0)"><\/script>');
pending…

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