Testing by developers and The Register has revealed that iOS 4.3 makes changes to the way "web apps" run that significantly impacts their performance compared to fully-native apps or apps run within the MobileSafari browser. In part, this is due to the presence of the new Nitro JavaScript engine, which significantly enhances performance -- but at present only works inside Safari. Other factors that hurt the performance of non-Safari web apps, however, have some wondering if Apple is deliberately deprecating the format to promote its own App Store.
