If you want the best quality prints you're probably better off compressing them yourself, assuming you already know how & have the tools. It will help you to know exactly what you're getting and it will probably decrease your upload (& their processing) time.
I've never used Costco, but have used a variety of in store photo centers and my universal experience has been that the less the store does to your pictures (other than print them) the better.
It would probably be worth a call to the photo lab to get the details on their printer/settings at which point we can be more specific.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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