HT204570: Get help with your iCloud Photo Library
Learn about Get help with your iCloud Photo Library
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Dec 12, 2015 6:46 AM in response to miky2884by chil1234,It could depend on the settings that you are uploading your photos at. You can check those in your settings on your iPhone. Settings>Photos & Camera> Record Video > then the settings you are recording at... with your 6s you could be recording 4K videos which would take a bit to load on your Mac.
You could also follow these steps: OS X El Capitan: If graphics-intensive tasks slow down your Mac