performance questions on dynamically loading Javascript Objects

Which is faster, 1. Using an XMLHTTP Get request and than using eval() for the reponsetext 2. Using the JSONP technique for loading a script and then evaling the innerHtml of the script. 3. Dynamically adding a script tag to the head of a document where the javascript object is being assigned to a variable? My gut tells me this should be option 3, but I am not sure how eval compares with using a script tag. Any thoughts?
Perhaps write a quick version of all 3 and benchmark the results? Try using a rather large Javascript object so any difference in speed is obvious.

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