It occurred to me that with an iPhone 6 and 6s (both 128GB) sat here I am in the perfect place to test the real world performance over USB2. The results were a little puzzling.

I used Image Capture to transfer the last two months of photos/videos from both phones (the 6s is an iTunes restore of the 6, they have identical data on them) to my brand new MacBook Pro 15. I checked that both of them transferred the same amount of data, ~435MB. I ran the test three times and averaged.

Oddly, the 6 was faster than the 6s; 25.8 seconds for the 6, 30.1 seconds for the 6s shocked

That equates to 16.8MB/s for the 6 and 14.4MB/s for the 6s, clearly not limited by USB2.

I'd love to know why the 6s was slower !
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Remind me to change my signature to something more interesting someday