perf test

app.js

var win = Ti.UI.createWindow();
var key = '#foo';
var start = new Date().getTime();
for (var i = 0; i < 10000; i++) {
	if (key.indexOf('#') === 0 && key !== '#' && !win.__iamalloy) {
		var bar = 1;
	}
}
console.log('time (__iamalloy): ' + ((new Date().getTime()) - start) + 'ms');

start = new Date().getTime();
for (var i = 0; i < 10000; i++) {
	if (key.indexOf('#') === 0 && key !== '#' && typeof win.getApiName === 'function') {
		var bar = 1;
	}
}
console.log('time (getApiName): ' + ((new Date().getTime()) - start) + 'ms');

start = new Date().getTime();
try {
	for (var i = 0; i < 10000; i++) {
		if (key.indexOf('#') === 0 && key !== '#') {
			var bar = 1;
		}
	}
} catch (e) {
	throw new Error('WTF');
}
console.log('time (exception): ' + ((new Date().getTime()) - start) + 'ms');

start = new Date().getTime();
for (var i = 0; i < 10000; i++) {
	if (key.indexOf('#') === 0 && key !== '#') {
		var bar = 1;
	}
}
console.log('time: ' + ((new Date().getTime()) - start) + 'ms');

results.txt

[INFO]  time (__iamalloy): 144ms
[INFO]  time (getApiName): 58ms
[INFO]  time (exception): 1ms
[INFO]  time: 1ms