It would be handy to plug a USB2 device into one of the USB3 ports
on a Pi4. The machine has a keyboard, mouse and FTDI TTL232R usb-
serial adapter in addition to the USB3 boot hard disk.
Will using one USB3 port for, say, the high-speed FTDI adapter slow
down traffic to the USB3 hard drive? I gather that at least some
usb devices slow down all ports when one port has a slow device,
but that notion is old and I'm not sure it applies to the Pi4.
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