Well, in my experience so far, having dropped to a USB2 cable at the mount end, there have not been any issues apparent so far with the USB2 speed with around 50Mb image frames every couple of minutes, guider frames every few seconds, guide pulses whenever they happen, mount control and position reporting to the driver etc.
That said, I will be working on cables as I would prefer to maintain the USB3 bandwidth if I can.
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