SanDisk Ultra USB3 speed from my Broadwell laptop is:

$ sudo dd if=live-image-i386.hybrid.iso of=/dev/sdb status=progress
420512256 bytes (421 MB) copied, 23.002299 s, 18.3 MB/s
823296+0 records in
823296+0 records out
421527552 bytes (422 MB) copied, 47.5528 s, 8.9 MB/s

Seems a bit crap, no?

bs=1M

Adjusting the block size does make it go faster, but it's still a LOT LESS than what USB3 is capable of.

$ sudo dd if=live-image-i386.hybrid.iso of=/dev/sdb bs=1M status=progress
402+0 records in
402+0 records out
421527552 bytes (422 MB) copied, 22.2003 s, 19.0 MB/s
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