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Dec 19, 2015 10:24 AM in response to Amunro5618by Old Toad,The library one your new iMac is considered a new library that's connected to the iCloud Photo Library so it must go thru the uploading process again. It won't duplicate the photos online but will go thru the process.
If you ever have the need to repair your Photos library that too will trigger an upload. A real inconvenience. That's spelled out in Fix missing or incorrect thumbnails in Photos - Apple Support.
Don't know of any way around it. A real inconvenience. You can tell Apple about it via https://www.apple.com/feedback/photos.html if you're so inclined.