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From: Cezary Tomczyk <cezary.tomczyk@gmail.com>
Newsgroups: comp.lang.javascript
Subject: Re: Mysterious slowdown in Chromium
Date: Sun, 06 Jan 2013 23:44:27 +0100
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W dniu 2013-01-06 17:33, Stefan Weiss pisze:
> On 2013-01-06 16:25, Gregor Kofler wrote:
>> Checked this on Chromium 22 (Ubuntu AMD64) in the web developer console
>>
>> (function bench() {
>>     function test() {}
>>     var runs = 10000000,  // adjust as needed
>>     t0 = +new Date();
>>     while (runs--) test();
>>     console.log((+new Date() - t0) + "ms");
>> })();
>>
>> Execution time stays constant with 90ms to 95ms.
[...]

Interesting results:

function bench() {
    function test() {};
    var runs = 10000000,  // adjust as needed
    t0 = +new Date();
    while (runs--) test();
    console.log((+new Date() - t0) + "ms");
};
bench();

15ms

var bench = function () {
    var test = function () {};
    var runs = 10000000,  // adjust as needed
    t0 = +new Date();
    while (runs--) test();
    console.log((+new Date() - t0) + "ms");
};
bench();

136ms

function test() {};
function bench() {
    var runs = 10000000,  // adjust as needed
    t0 = +new Date();
    while (runs--) test();
    console.log((+new Date() - t0) + "ms");
};
bench();

31ms

Tested on Google Chrome 23.0.1271.97, Windows 7 64bit.

Firefox 17.0.1 and Opera 12.12 was very slow in all above examples. More 
or less ~ 3 to ~ 13 seconds, while IE9 ~ 440 ms.

-- 
Cezary Tomczyk
http://www.ctomczyk.pl/