Are GWT and Cappuccino running slow on mobile devices?

I've 2 questions:

1. Are GWT and Cappuccino web applications running slow on iPhone/iPad/Android devices ? Or is Capuccino much slower than GWT because it is not compiled ? Is GWT fast on mobiles ?

2. My idea is to develop the same app for the desktop using Cappuccino, and adapt the same code for iPhone and iPad (Objective-J is similar to Objective-C..). Is thi开发者_运维技巧s a good idea ? Feasable ? Drawbacks ?

thanks

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I have two production GWT apps (one is using GWT-EXT and the other EXT-GWT ((GXT))) that I have tested on the iPhone. They both worked well on my old iPhone 3G and work even better on my iPhone 4.

These are not small apps and were originally designed for the desktop

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Cappuccino is compiled as well. Just run jake deploy before deploying. I believe the iPad app "Air Forms" is written in Cappuccino.