My printer is an HP DeskJet 970Cse. HP's article at
http://snurl.com/36mv notes the ideal bandwidth of the various
connection types used for printers which a serial at 53 Kbps,
parallel at 360 Kbps, USB at 12 Mbps (for v1.1, xxx for v2.2), Ethernet
at 10 Mbps (although it could be 10/100/1000 Mbps). However, that's
only the speed for that connection medium. It doesn't say what is the
max data rate at which the printer itself will accept data. If, say,
the printer only accepts data at 100 kbps then the parallel port is more
than sufficient to handle the printer traffic load. How fast can the HP
970Cse accept data? HP's article a http://snurl.com/36mx doesn't
specify the max input data rate. If the printer can accept at a faster
rate then I would move it to the USB port. But there's no point in
polluting the USB with printer traffic if the parallel port is more than
sufficient to handle the printer traffic.

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