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Performance of these types frameworks on anything other than the beefiest mobile hardware is woeful.

I get your point though... 1 click deployment to multiple devices is a great feature.

True, performance on older mobile hardware's not great, my old htc hero runs the demos at a pretty glacial pace. But it wasn't so long ago that javascript performance was apparently so poor that web apps would never catch on and remember this is an alpha version so it's going to get quicker.

I do agree native apps are going to be more appropriate in a number of situations though.

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