Subject: Re: ACR 3.3 and DNG -- Updating Settings ....
If you have no use for the embedded JPEG preview (none of the Creative Suite software uses it), you can avoid the speed hit by going to Camera Raw Preferences, and uncheck "Update embedded JPEG previews."
If you find that you later need to use the previews in some third-party software (Extensis Portfolio and iView both use them, for example), you can update the previews by opening the DNGs in Camera Raw and choosing Export Settings from the Camera Raw menu.
So you don't lose anything by not updating the previews at time of edit.
View All Messages in adobe.photoshop.camera.raw
ACR 3.3 and DNG -- Updating Settings .... =>
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