More Infos:
I'm also on Precise and confirm this bug it's really annoying a lot!

In my case Nautilus regularly eats memory while simply copying files.
I've started to copy a large tree of small files two days ago in the morning 
from an USB disk to another; the copy was the only process in a regular running 
state. I came back home yesterday, 36 hours later, and nautilus copy was still 
running using about 1/3 of my 8GB of precious RAM while copying at only 1MB/sec 
against usual 10-15MB/sec; CPU usage was also very high, near 100% of the used 
processor.
I stopped the process, rebooted and started to copy a smaller tree each time.
The memory leak was always in place for each tree I copied, increasing the 
memory used as well as the charge on the CPU taking care of running the 
process; these are collected steps:
- 1st tree (13.3GB,55k files): RAM 0.76%->1.94%(+1.18%), ~12MB/sec, ~5-6%CPU
- 2nd tree (8,5GB,30k files): RAM 1.95%->2.39%(+0.44%), ~10MB/sec, ~8-10% CPU
- 3rd tree (14,0GB,50k files): RAM 2.40%->3.52%(+1.12%), ~9MB/sec, ~11-15%CPU
- 4th tree (13,6GB,48k files): RAM 3.53%->4.55%(+1.02%), ~8MB/sec, ~14-20%CPU
- 5th tree (20,9GB,105k files): RAM 4.56%->6.69%(+2.13%), ~7MB/sec, ~17-25%CPU
- 6th tree (28,8GB,146k files): RAM 6,70%->9,86%(+2.16%), ~6MB/sec, ~20-30%CPU
The memory leak seems loosely coupled to the number of copied files, maybe to 
the total length of the filenames managed?
The higher CPU usage seems simply related to the waste of RAM memory.
When the copy was completed nautilus CPU usage went down to 0.17% while RAM 
usage remained 9.86%.

It could be interesting I'm using:
- Dropbox
- Desktop Background Image changing (Webilder)
but changing in RAM/CPU usage did not seem at all related to these processes.

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https://bugs.launchpad.net/bugs/952108

Title:
  [Precise] Nautilus: memory leak

Status in Nautilus:
  New
Status in “nautilus” package in Ubuntu:
  Triaged

Bug description:
  Hello,

  It's just to note that Nautilus has memory leaks with the latest
  version: with an uptime of 10 hours, Nautilus uses 420Mo.

  It's maybe interesting to know that:
   * I'm using a slideshow and not one single image as background.
   * I opened Nautilus in directories where big files were being downloaded 
(and Nautilus regularly refreshed their preview)
   * I made a few actions (like opening directories with a lot of files, moving 
files, creating directories, extracting tarball, etc.)
   * I'm using a few plugins like nautilus-dropbox, nautilus-image-converter, 
etc.
   * I've bookmarks with special characters like 'Vidéos' and 'Téléchargements'.

  I hope it will help you to fix this bug ;)

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: nautilus 1:3.3.91-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
  Uname: Linux 3.2.0-18-generic x86_64
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: amd64
  Date: Sun Mar 11 10:35:32 2012
  GsettingsChanges:
   org.gnome.nautilus.window-state geometry '800x552+483+87'
   org.gnome.nautilus.window-state start-with-status-bar true
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  SourcePackage: nautilus
  UpgradeStatus: No upgrade log present (probably fresh install)

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