case A: the new printer uses the bandwidth on slot B, both run as fast
as if they were the only USB printer;
case B: the new printer share bandwidth with the old one, the result is
both printer work 1/2 fast, that is equal to not having bought another
printer at all.

Which one is true?

None, and both. Printer can not print as fast as you can pump data
through usb2 (480Mbps), unless you have some *really* expensive printer.
So even if you had 2 printers on usb, sharing common usb-bandwidth, you
could print much more documents in the same time, as with 1 printer...

Jarry

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