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POWhat is the runtime of `Node.insertBefore`?
 

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  1. POWhat is the runtime of `Node.insertBefore`?
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    <p>I realize that each browser would implement it differently, but are there any references or benchmarks that specify this?</p> <p>The simplest implementation would seem to be <code>O(n)</code> in the number of children of <code>Node</code></p> <p>EDIT: I ran some benchmarks. Here are the results</p> <p>FireFox 3.6.10 on Linux</p> <pre><code>inserted 1000 elements into 1000 elements in 131.44 ms (average over 101 trials, 291.31 ms inc appendChild) while in dom: true inserted 1000 elements into 10000 elements in 235.91 ms (average over 11 trials, 1311.36 ms inc appendChild) while in dom: true inserted 1000 elements into 100000 elements in 2349.00 ms (average over 2 trials, 14150.50 ms inc appendChild) while in dom: true inserted 1000 elements into 1000 elements in 13.13 ms (average over 101 trials, 267.00 ms inc appendChild) while in dom: false inserted 1000 elements into 10000 elements in 67.45 ms (average over 11 trials, 1517.09 ms inc appendChild) while in dom: false inserted 1000 elements into 100000 elements in 617.00 ms (average over 2 trials, 15214.50 ms inc appendChild) while in dom: false </code></pre> <p>Chrome 7 on Linux:</p> <pre><code>inserted 1000 elements into 1000 elements in 0.65 ms (average over 101 trials, 30.34 ms inc appendChild) while in dom: true inserted 1000 elements into 10000 elements in 1.55 ms (average over 11 trials, 175.09 ms inc appendChild) while in dom: true inserted 1000 elements into 100000 elements in 12.00 ms (average over 2 trials, 2255.00 ms inc appendChild) while in dom: true inserted 1000 elements into 1000 elements in 0.49 ms (average over 101 trials, 41.13 ms inc appendChild) while in dom: false inserted 1000 elements into 10000 elements in 1.36 ms (average over 11 trials, 301.18 ms inc appendChild) while in dom: false inserted 1000 elements into 100000 elements in 12.00 ms (average over 2 trials, 2565.50 ms inc appendChild) while in dom: false </code></pre> <p>I created a dom Node, populated it with <code>N</code> elements, and then called <code>insertBefore(newchild, randominitialchild)</code> <code>M</code> times.</p> <p><code>in dom: false</code> means that the parent Node was not added to the document tree, so the browser should not be recalculating the layout (I hope?)</p> <p>The results seem to show that inserting is <code>O(n)</code></p>
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