Profile javascript on iOS

Question

My iPad javascript-based web-app is running rather slowly at times. Is there any way to profile the javascript code on a iPad?

Answer 1

The YUI Profiler is a js-only profiler that can grab the stats for you, you can then toss it back to your desktop machine to view it with flash charting:

YUI Profiler Page at Yahoo Developmer Network

Answer 2

If you have access to an Android phone, you can profile your application using desktop Chrome's developer tools and a USB cable (very convenient).

Android and iPhone behave+perform similarly, but not identically. That said, for 90% of use cases, if you improve performance on Android, you'll see the same improvements on iPhone.

https://developers.google.com/chrome/mobile/docs/debugging

It'll require Chrome, an Android device able to run the android Chrome app, and a USB cable.

You have to install and use the ADB console command, but once its working, you'll have the full chrome developer tools interface available for debugging mobile.