Transferring movies usb 3.0 speeds?

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So I'm transferring all my movies (no pirating, bought them all) from a couple 4tb hd's to an 8 tb hd and am only getting about 64-74 MB/s using USB 3.0. Does that seem slow? Is it just a low processing thing or can I speed it up somehow. Been running since last night and I still have a ton to do (about 8 hrs according to the window)