Speed testing local vs namespaced vs global var

speed test

var n = 0,
    i = 0,
    GL = {
        i: 0,
    };

//incrementation on a local variable
console.time('local');
n = 0;
while(n < 2000000){
    var j = 0;
    j++;
    n++;
}
console.timeEnd('local');

//incrementation on a namespaced variable
console.time('Namespaced');
n = 0;
while(n < 2000000){
    GL.i++;    
    n++;
}
console.timeEnd('Namespaced');

//incrementation on a global variable
console.time('global');
n = 0;
while(n < 2000000){
    i++;
    n++;
}
console.timeEnd('global');