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VERY SLOW vehicle binary log file download thru Raspberry Pi

Hi,

Download speed is only about 20KBps (with about 10% of MAVLink message loss reported by QGC) when downloading logs from Pixhawk -> Pi -> Tether/Fathom-X (100m ethernet) -> PC (QGC). If I connect my PC directly to the Pixhawk via USB, it downloads much faster, and almost no message loss.

Is there anything I can configure in Rsp Pi so the transfers between Rsp Pi and Pixhawk are faster (mavproxy in Rsp Pi is set to 115200 baud rate, does that have anything to do? Can it be increased?

Or is just a problem related to the length of the cable (the rolled long tether cable causes the 10% message loss?)

Thanks in advance.