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 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....
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();...
I just have a general question about debouncing. I have three menus at different positions on the page that when they reach a position 85px from the top of the window on scroll they become fixed. They are layered to overlap as they reach the top. I c...
I am doing speed optimization for my website application. And I found some practises to do that. For example Best Practices for Speeding Up Your Web Site from Yahoo. Among them are:   Minify JavaScript and CSS. Minimize number of HTTP Requests by com...
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