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It's a page full of JS UI widgets including the codemirror editor, google maps, a calendar, select2 and more all in one page. It's a demo page for devs to checkout on their desktop really, I don't think Angular is to blame here, with so many widgets on a single page it would be slow on mobile even with vanilla JS.

Funnily enough, my own angularjs project is slow - and often crashes the browser - on my android device...

I've never been able to work out why.

4s?

The iPhone 4S is a touchscreen-based smartphone developed by Apple Inc. It is the fifth generation of the iPhone, succeeding the iPhone 4.