I'm having this issue right now on 16.04. What's strange, is that if I
copy say 600GB worth of thousands of files, about half way through, Xorg
will start chewing up resources, and everything slows down to a hault,
even though literally the only thing I ever opened was Nautilus. I
never opened Firefox, or anything elses. Straight boot to the file
manager to copy files. It's a weird issue to say the least, because I
can't determine why Xorg would be freaking out on large file copying.
If the files finish, the performance is still poor until I reboot the
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Ubuntu slows down and hangs while copying file from/to USB
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