Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var COLS = 100;
    var ROWS = 100;
    
    var newArr = function() {
        var arr = new Array( COLS*ROWS )
        for ( var i = 0; i < arr.length; i++ ) {
            arr[i] = (i*3)%29;
        }
        return arr;
    }
  };
</script>

Test runner

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var arr = newArr()

for ( var i = 0; i < ROWS; i++ ) {
    for ( var j = 0; j < COLS; j++ ) {
        arr[j*ROWS + i] += 2;
    }
}

var arr = newArr()

for ( var j = 0; j < COLS; j++ ) {
    for ( var i = 0; i < ROWS; i++ ) {
        arr[j*ROWS + i] += 2;
    }
}

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