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You only have one USB controller in the computer. So each port has a share of the CPU time.
Same as downloading from 2 or more USB ports. The transfer speed drops off per port as you increase the number of ports.
Try adding another USB controller. This allows a seperate USB controller to run in conjuction with the onboard unit. You should see an increase then.
A 4 port hub makes it worse, as it combines an extra 4 ports to be read by 1 port.
Theo.
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