jussimalinen/gist:6705787

## gistfile1.txt
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="output"></div>
<script type="text/javascript">
    String.prototype.repeat = function(num) {
      return new Array(isNaN(num)? 1 : ++num).join(this);
	}
	var output = document.getElementById('output');
    var shortStr = '\xe8\x87\xaa\xe8\x8d\x8a\xe6\xb9\x96\xe4\xbb\xa5\xe5\x8c\x97';
    var longStr = shortStr.repeat(1000);
    var newDecode = function (utftext) {
        return decodeURIComponent(escape(utftext));
    };

    var oldDecode = function (utftext) {
        var string = [],
            i = 0,
            c = 0,
            c2 = 0,
            c3 = 0,
            len = utftext.length;

        while (i < len) {
            c = utftext.charCodeAt(i);

            if (c < 128) {
                string.push(String.fromCharCode(c));
                i++;
            } else if ((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i + 1);
                string.push(String.fromCharCode(((c & 31) << 6) | (c2 & 63)));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i + 1);
                c3 = utftext.charCodeAt(i + 2);
                string.push(String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)));
                i += 3;
            }
        }
        return string.join('');
    }
    var before = new Date().getTime()
    oldDecode(longStr);
    var oldTime = new Date().getTime() - before;
 	before = new Date().getTime()
    newDecode(longStr);
    var newTime = new Date().getTime() - before;
    output.innerHTML += 'Old: ' + oldTime.toString() + 'ms<br />';
	output.innerHTML += 'New: ' + newTime.toString() + 'ms';
</script>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	</head>
	<body>
	<div id="output"></div>
	<script type="text/javascript">
	String.prototype.repeat = function(num) {
	return new Array(isNaN(num)? 1 : ++num).join(this);
	}
	var output = document.getElementById('output');
	var shortStr = '\xe8\x87\xaa\xe8\x8d\x8a\xe6\xb9\x96\xe4\xbb\xa5\xe5\x8c\x97';
	var longStr = shortStr.repeat(1000);
	var newDecode = function (utftext) {
	return decodeURIComponent(escape(utftext));
	};

	var oldDecode = function (utftext) {
	var string = [],
	i = 0,
	c = 0,
	c2 = 0,
	c3 = 0,
	len = utftext.length;

	while (i < len) {
	c = utftext.charCodeAt(i);

	if (c < 128) {
	string.push(String.fromCharCode(c));
	i++;
	} else if ((c > 191) && (c < 224)) {
	c2 = utftext.charCodeAt(i + 1);
	string.push(String.fromCharCode(((c & 31) << 6) \| (c2 & 63)));
	i += 2;
	} else {
	c2 = utftext.charCodeAt(i + 1);
	c3 = utftext.charCodeAt(i + 2);
	string.push(String.fromCharCode(((c & 15) << 12) \| ((c2 & 63) << 6) \| (c3 & 63)));
	i += 3;
	}
	}
	return string.join('');
	}
	var before = new Date().getTime()
	oldDecode(longStr);
	var oldTime = new Date().getTime() - before;
	before = new Date().getTime()
	newDecode(longStr);
	var newTime = new Date().getTime() - before;
	output.innerHTML += 'Old: ' + oldTime.toString() + 'ms<br />';
	output.innerHTML += 'New: ' + newTime.toString() + 'ms';
	</script>
	</body>
	</html>