Tried that a while ago, it made working with already open applications
and playing music OK (it stopped stuttering while copying), but if I
copy something large and want, for example, to start a terminal window,
I can click on terminal icon, but the window won't be shown until
copying is finished. I mean, how much disk activity is needed for
opening terminal window?

I have 3 harddisks in my machine. Let's say that OS is on HD1. The same
problem with starting terminal occurs even if I start copying from HD2
to HD3, so I guess it has nothing to do with HD speed and/or caching.

And this is not only Nautilus problem (at least for me). Same thing
happens if I copy/unpack from command line, or Double Commander
(unpackig large archives does the same thing). Generally, every time
some process has a lot of work with hard drive (it doesn't need to be an
USB HD, that makes things just more sluggish), my computer is noticeably
less usable until HD work is finished. I think that something is wrong
with the way I/O operations are scheduled, as some processes can take
all the machine's disk I/O resources for themselves, leaving absolutely
nothing for others.

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https://bugs.launchpad.net/bugs/1208993

Title:
  Ubuntu slows down and hangs while copying file from/to USB

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