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You should install 4.1 on your 3G and I think it will fix it.

I too experienced the "freezes from hell" with iOS 4.0 running on my 3G, but ever since upgrading to 4.1 on Wednesday I've had no more freezes.

(Yes, it does. You should install it.)

(But it's still slower than iOS 3, so consider downgrading/not bothering upgrading in the first place unless you really need the 1 or 2 features of iOS 4 that they actually provide to your phone)

But it so happen that Apple can do something about that, but can't do anything if Flash ruins the user experience.

Case in point on the Mac side Flash was (and is?) horrible but Adobe couldn't seem to give it a second thought.