Comma is faster than semicolon in Safari / JavaScriptCore

gistfile1.js

// ** Update:
// ** THIS ONLY AFFECTS CODE PASTED INTO WEB INSPECTOR CONSOLE
// ** ACTUAL LOADED CODE ON WEB PAGE RUNS ALMOST THE SAME WITH COMMAS OR SEMICOLONS.
// **

// Safari Version 6.0.2 (8536.26.17)
// Output:
//
// comma: 193 ms
// semicolon: 575 ms

(function() {
    var t1=(new Date()).getTime();
    var a=1, b=2, c=3, d=4;
    for (var i = 0; i < 1000000; i++) {
    	a^=b,
	b^=a,
	b+=c,
	d+=a,
	a^=c,
	d^=a,
	c+=d
    }
    console.log('comma: '+((new Date()).getTime()-t1)+' ms');

    t1=(new Date()).getTime();
    a=1; b=2; c=3; d=4;
    for (var i = 0; i < 1000000; i++) {
    	a^=b;
	b^=a;
	b+=c;
	d+=a;
	a^=c;
	d^=a;
	c+=d;
    }
    console.log('semicolon: '+((new Date()).getTime()-t1)+' ms');
})();