Saturday, June 18, 2011

Find: iOS 5 finally brings Nitro JavaScript speed to home screen Web apps

Fast web apps, even they are desktop bookmarks. Interesting discussion of js security.

iOS 5 finally brings Nitro JavaScript speed to home screen Web apps




Apple brought huge JavaScript performance improvements to Mobile Safari in March of this year, but those benefits didn't extend to Web apps saved to a user's home screen. iOS 5 will remedy that situation, however, finally putting home-screen Web apps on equal performance footing with those that run in the browser.

Apple brought its Nitro JavaScript engine to Mobile Safari as part of iOS 4.3. Nitro uses just-in-time compilation to dynamically convert interpreted JavaScript code into compiled native ARM code that runs as much as 2.5 times faster than interpreted code. The engine then changes the area in the memory where the native code is stored from writeable (for data storage) to executable (for code) to run the code directly.


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