Say I have a fairly hefty JavaScript file, packed down to roughly 100kb or so. By file I mean it’s an external file that would be linked in via <script src="...">, not pasted into the HTML itself.  Where’s the best place to put th...
I've heard this quite a few times. Are JavaScript loops really faster when counting backward? If so, why? I've seen a few test suite examples showing that reversed loops are quicker, but I can't find any explanation as to why!  I'm...
I've recently read the Yahoo manifesto Best Practices for Speeding Up Your Web Site. They recommend to put the JavaScript inclusion at the bottom of the HTML code when we can.  But where exactly and when?  Should we put it before closing </h...
I was browsing Google Code when I chanced upon this project called JSpeed - optimization for Javascript.  I noticed one of the optimization was to change i++ to ++i in for loop statements.  Before Optimization  for (i=0;i<1;i++) {}  for (var i =...
I've just written my first google apps scripts, ported from VBA, which formats a column of customer order information (thanks to you all of your direction).  Description:   The code identifies state codes by their - prefix, then combines the fo...
I find the practice of caching an array's length property inside a for loop quite distasteful. As in,  for (var i = 0, l = myArray.length; i < l; ++i) {     // ... }   In my eyes at least, this hurts readability a lot compared with the straigh...
I'm looking for some applications or websites that minimize css and js files.  Ideally, they could batch them all or if not, one at a time....
Still trying to answer this question, and I think I finally found a solution, but it runs too slow.  var $div = $('<div>')     .css({ 'border': '1px solid red', 'position': 'absolute', 'z-index':...
I've seen some performance critical javascript code, like the one on this project that makes extensive use of bitwise OR operations with 0. Ex:  GameBoyAdvanceCPU.prototype.write8 = function (address, data) { address = address | 0; data = data |...
So I have this simple code:  function Run () {   var n = 2*1e7;   var inside = 0;   while (n--) {     if (Math.pow(Math.random(), 2) +         Math.pow(Math.random(), 2) < 1)       inside++;   }    return inside; }  var start = Date.now(); Run();...

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