Did you rebuild statistics?
I do believe that even though the servers may be configured the same/same hardware, when you restore a database the stats get "out of whack".
I may be wrong, and if I am someone will most likely point it out here. :w00t:
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Personal Motto: Why push the envelope when you can just open it?
If you follow the direction given HERE[/url] you'll likely increase the number and quality of responses you get to your question.
Jason L. Selburg