gistfile2.txt

$ js -v
JavaScript-C 1.8.0 pre-release 1 2007-10-03
$ js speed.js 
1 childs:	0
10 childs:	1
100 childs:	3
1000 childs:	40
10000 childs:	217
100000 childs:	5692

speed.js

// creating a deep prototypal chain (inheritance)
function test(n) {
    var mom = function(){};
    mom.prototype.name = "mom";
    
    for(var i=0;i<n;i++) {
        var son = function() {};
        son.prototype = new mom;
        mom = son;
    }

    return mom;
}

function speed(fn, n) {
    var class = fn(),
        obj = new class(),
        now = new Date();

    for(var i=0;i<n;i++) {
        obj.name == "mom";
    }
    return new Date() - now;
}

for(var i=0;i<6;i++){
    var quantity = Math.pow(10, i);
    print(quantity+" childs:\t" + speed(function() { return test(quantity) }, 1000));
}