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Slow transfer/write speed to USB 3 flash. What are all possible solutions?

Please see the following screenshot of transferring to a USB 3 sandisk flash drive:

enter image description here

This has been asked before but the answers didn’t help. They always suggest changing this:

echo $((16*1024*1024)) > /proc/sys/vm/dirty_background_bytes
echo $((48*1024*1024)) > /proc/sys/vm/dirty_bytes

but this time, it does nothing for me. The xfer starts out somewhat fast and then slows to this pitiful speed, basically grinding to a halt. The file in the screenshot is only 2GB. If I were on Windows right now (Spooky thought) this would be no problem.

I would like to know every possible thing to try for this problem. All of it. Dirty dirty write, flushing, drivers, whatever. bring it.

5.3.0-28-generic

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