DOM operations are expensive

JavaScript performance comparison

Test case created by Raymond

Preparation code

<div id="el"></div>
    

Preparation code output

<div id="el"></div>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Slow
var el = document.getElementById('el');
for (var i = 0; i < 10; i++) {
    el.innerHTML += 'a';
}
pending…
Fast
var el = document.getElementById('el'), inner = '';
for (var i = 0; i < 10; i++) {
    inner += 'a';
}
el.innerHTML = inner;
pending…

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