appendChild vs. DocumentFragment vs. innerHTML

JavaScript performance comparison

Revision 32 of this test case created

Info

Comparing 2 different ways to dynamically insert new elements into the DOM tree.

Preparation code

<div id="test1"></div>
<script>
Benchmark.prototype.setup = function() {
    window.content = {
        // a simple string to be attached via innerHTML
        string: '<div>Testing innerHtml and DOM-based methods on <strong>massive</strong> add.</div>',
   
        // a node to be attached using DOM methods
        dom: (function () {
            var node, strong;
            node = document.createElement('div');
            node.appendChild(document.createTextNode('Testing innerHtml and DOM-based methods on '));
            strong = document.createElement('strong');
            strong.appendChild(document.createTextNode('massive'));
            node.appendChild(strong);
            node.appendChild(document.createTextNode(' add.'));
            return node;
        })()
    };
};
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
innerHTML
var div1 = document.getElementById("test1"),
    content = window.content,
    html = [];

for (var i = 0; i < 10000; i++) {
    html.push(content.string);
}

div1.innerHTML = html.join('');
div1.innerHTML = '';
pending…
DocumentFragment
var div1 = document.getElementById("test1"),
    content = window.content,
    frag = document.createDocumentFragment();

for (var i = 0; i < 10000; i++) {
    frag.appendChild(content.dom.cloneNode(true));
}

div1.appendChild(frag);
div1.innerHTML = '';
pending…
DocumentFragment with new node creation
var div1 = document.getElementById("test1"),
    frag = document.createDocumentFragment();

for(var i=0; i<1000; i++){
    var el = document.createElement('div');
    el.innerHTML = Math.random();
    frag.appendChild(el);
}

div1.appendChild(frag);
div1.innerHTML = '';
pending…

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