jQuery UI is pretty sluggish under some of the iOS build-app-in-JS frameworks (e.g., PhoneGap) and for webapps because those don't use the new nitro engine (I understand that's coming in iOS 5). It's not nearly as bad under standalone Safari with a mobile web page. If someone wanted to test their performance claims, that might be a good thing to try.
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jQuery UI is pretty sluggish under some of the iOS build-app-in-JS frameworks (e.g., PhoneGap) and for webapps because those don't use the new nitro engine (I understand that's coming in iOS 5). It's not nearly as bad under standalone Safari with a mobile web page. If someone wanted to test their performance claims, that might be a good thing to try.