Best format for Premiere Pro CS6?

I’d like to get more performane our of Premiere CS6.  Native AVCHD is sluggish on my Macbook Pro even with dropping the resolution while editing.  What is the best format to transcode to?  I was thinking ProRes 422. BUT, that’s not an option in Prelude. But, H.264 is.  This project will be put onto Vimeo when finished. 


Anyone have any opinions on this one?

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