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Apple to Limit iPhone 15 USB-C Cables to USB 2.0 Speeds: Report
(www.extremetech.com)
This is a most excellent place for technology news and articles.
I mean with 400 Mbps its still like 3 seconda per gigabit/byte( not realy sure which one usb speed is mesured ) . Its possible that its the internal storage speed thats the limiting factor ( or the itune app on Windows ) if its that slow.