Performance logging in Chrome

perflog

function perfLog(fun, context) {
	var context = context || this;
	var realFun = context[fun.name];
	context[fun.name] = function() {
		console.time(fun.name);
		var result = realFun.apply(context, arguments);
		console.timeEnd(fun.name);
		return result;
	}
}

//How to use
perfLog(eval);
perfLog(document.body.appendChild, document.body);

Wow @mikaelbr. That's awesome feedback! Thanks!