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    <p>It was an interesting question, so I ran some very simple tests (I should have restarted my browsers to clear out the memory, but I didn't; take this for what it's worth). It looks like at least on Safari and Firefox, <code>prototype</code> runs significantly faster [edit: not 20x as stated earlier]. I'm sure a real-world test with fully-featured objects would be a better comparison. The code I ran was this (I ran the tests several times, separately):</p> <pre><code>var X,Y, x,y, i, intNow; X = function() {}; X.prototype.message = function(s) { var mymessage = s + "";} X.prototype.addition = function(i,j) { return (i *2 + j * 2) / 2; } Y = function() { this.message = function(s) { var mymessage = s + "";} this.addition = function(i,j) { return (i *2 + j * 2) / 2; } }; intNow = (new Date()).getTime(); for (i = 0; i &lt; 1000000; i++) { y = new Y(); y.message('hi'); y.addition(i,2) } console.log((new Date()).getTime() - intNow); //FF=5206ms; Safari=1554 intNow = (new Date()).getTime(); for (i = 0; i &lt; 1000000; i++) { x = new X(); x.message('hi'); x.addition(i,2) } console.log((new Date()).getTime() - intNow);//FF=3894ms;Safari=606 </code></pre> <p>It's a real shame, because I really hate using <code>prototype</code>. I like my object code to be self-encapsulated, and not allowed to drift. I guess when speed matters, though, I don't have a choice. Darn. </p> <p>[Edit] Many thanks to @Kevin who pointed out my previous code was wrong, giving a huge boost to the reported speed of the <code>prototype</code> method. After fixing, prototype is still around significantly faster, but the difference is not as enormous.</p>
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    1. POJavascript prototype operator performance: saves memory, but is it faster?
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    1. COI can also verify that this benchmark looks correct… Although I'm curious about the low Safari number. What version are you using? On my machine, I see: FireFox 3.6.8: 5030/377, Safari 5.0: 3037/264.
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      1. USDavid Wolever
    2. COIt would also be interesting to see the time breakdown — ie, how much time it takes to instantiate each of `X` and `Y`, how much time it takes to look up a property (ex, `var tmp = x.message;`) and how much time it takes to call a property (ex, `x.message('hi')`).
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    3. CO@David Wolever - My Safari is 5.0.6553.16, which got pushed out fairly recently. I'm on a Mac though. I'm not sure why I don't use Safari more. It's ludicrously fast and the debugger is vastly superior over Firebug, but stupidly I never use it except when I have to. I tried what you suggested. A single property lookup adds about 10% above instantiation-only. Both methods showed roughly the same increase. So there doesn't seem to be any additional cost or savings to using either method. That kind of surprised me. Again, it would be far better to try this with a real-world example.
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