I have this problem on Ubuntu 16.04. Not only the system becomes very
slow, but also the USB transfer speed is horrible. From USB3 port into
USB2 drive it goes down to 2-3 MB/s

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

Status in nautilus package in Ubuntu:

Bug description:

  While copying many and large files to and from a USB drive, the system
  becomes incredibly slow and sometimes hangs. I watched the system
  monitor while it was running slowly but cpu was not above 50% at any
  time, the same for memory.

  I'm using the "WD my passport" HD with a USB3 port of my "ASUS K55VD"

  Description:  Ubuntu 13.04
  Release:      13.04

    Installed: 1:3.6.3-0ubuntu16
    Candidate: 1:3.6.3-0ubuntu16
    Version table:
   *** 1:3.6.3-0ubuntu16 0
          500 http://ubuntu-archive.mirror.nucleus.be/ raring/main amd64 
          100 /var/lib/dpkg/status

  Steps to reproduce:
  1) Aquire many large files (like your totally legit moviecollection)
  2) Copy files to external HD
  3) Open your browser and be sad when your system becomes incredibly slow 
after a few minutes

  This is my first bugreport so if I'm missing something, please tell

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: nautilus 1:3.6.3-0ubuntu16
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic
  Uname: Linux 3.8.0-27-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  Date: Tue Aug  6 22:56:34 2013
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/nautilus
   b'org.gnome.nautilus.window-state' b'geometry' b"'656x715+154+151'"
   b'org.gnome.nautilus.window-state' b'maximized' b'true'
  InstallationDate: Installed on 2013-05-31 (67 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: True
  SourcePackage: nautilus
  UpgradeStatus: No upgrade log present (probably fresh install)

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