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"""I always think if your site can't be host by GAE, then it's probably not very scalable at the first place. I"""

Well, your site is basically one static page. Do you really feel qualified discussing GAE?

its backend is hosted by GAE

So, all of the dynamic backend code powering the app is running on Google App Engine.

Of course I do. The ENTIRE game logistics runs on GAE, the iPhone stores zero data except a user key.