I just tried booting in rescue mode, opened a shell as root and copied
the same ISO file to the USB stick with Midnight Commander, and it
copied MUCH faster - averaging 5.6 MB/sec.

I then tried booting normally, but at GDM screen switched to a text vty,
and repeated the copy with MC again. Still good, about 5.5 MB/sec.

I then tried logging into Gnome, opening a terminal and copying the same
file with MC again... it gets to about 25-30% complete, then just gets
slower, and slower, and slower, eventually bottoming out at around 650
KB/sec.

This looks like it's something related to whatever is running during a
Gnome session. Maybe GVFS-related, but I doubt it, since I specifically
mounted the USB stick manually as root from a bash prompt, and used MC
to copy (which wouldn't be using GVFS).

-- 
USB file transfers extremely slow and eventually cause kernel freezes
https://bugs.launchpad.net/bugs/183839
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