Web apps run more slowly under iOS 4.3 because they are not optimized for the new JavaScript engine Nitro.
The Register is the info directly from Apple, whose spokeswoman Trudy Muller said: "The embedded web viewer does not take advantage of performance optimizations Web Safari.
Among these improvements include the JavaScript engine as well as some caches Nitro Safari and also render mode "asynchronous browser's IOS. However Apple has not said if they had to overcome, or how soon. [The Register]
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