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I have built lots and lots of stuff on mobile web. Never once was JavaScript perf the bottleneck on iOS. Never (especially since the rise of retina screens).

I think there is a lot of hyperbole around the whole JIT in webview thing from people who don't have a good grasp of where the performance problems are on mobile web.

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This. To my knowledge, JS perf isn't an issue in any modern browser (even the crippled iOS webview). Improving the performance of DOM access and manipulation (not just on iOS) would be a much more fruitful enterprise and is something I would like to see all browser makers focusing on.

A million times this. XML at the end of the day is a language with only two types, strings and children. This is woefully inadequate if you want performance.

Take a 3D matrix transform for example. It needs to be marshalled from an array of floats to a string to be applied. Then it needs to be parsed back into an array of floats to be used to position a texture in the GPU. Such a huge waste...

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