Metro style apps in Windows 8 have all the performance benefits of IE10 when showing Web content. In Metro style apps, Web content is always JIT compiled and hardware-accelerated. Other platforms do not provide the same level of performance in apps. For example, Cocoa apps on iOS offer significantly worse JavaScript performance (via the UIWebView control) than the same content running in Safari. These Cocoa apps do not enjoy JIT compilation, and these apps cannot show and use Web content the same way the browser on the system can:
Testing configuration: http://www.webkit.org/perf/sunspider/sunspider.html.
iPad: 1st Gen, iOS 5.0.1.
Windows 8: Developer Preview, Dell Optiplex 745, 64-bit OS.
Kindle Fire v1.
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