The same bug exists on Nemo (should there be different bug report?) It is less troublesome when you don't set Nemo as handling also your desktop, because closing Nemo correctly frees the memory.
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.1 LTS Release: 14.04 Codename: trusty $ uname -a Linux alain-Desktop 3.13.0-33-generic #58-Ubuntu SMP Tue Jul 29 16:45:05 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux $ dpkg -s nemo Package: nemo Status: install ok installed Priority: optional Section: misc Installed-Size: 2096 Maintainer: Ubuntu Developers <[email protected]> Architecture: amd64 Version: 1.8.4-1.1 Depends: desktop-file-utils (>= 0.7), gsettings-desktop-schemas, gvfs (>= 1.3.2), libglib2.0-data, nemo-data (= 1.8.4-1.1), shared-mime-info (>= 0.50), libatk1.0-0 (>= 1.32.0), libc6 (>= 2.14), libcairo-gobject2 (>= 1.10.0), libcairo2 (>= 1.10.0), libexempi3 (>= 2.2.0), libexif12, libgail-3-0 (>= 3.0.0), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.37.3), libgnome-desktop-3-7 (>= 3.2.0), libgtk-3-0 (>= 3.3.18), libnemo-extension1 (>= 1.1.2), libnotify4 (>= 0.7.0), libpango-1.0-0 (>= 1.20.0), libpangocairo-1.0-0 (>= 1.14.0), libx11-6, libxml2 (>= 2.7.4) Recommends: eject, gvfs-backends, librsvg2-common, nemo-fileroller Suggests: eog, evince | pdf-viewer, totem | mp3-decoder, xdg-user-dirs Conffiles: /etc/xdg/autostart/nemo-autostart.desktop 01d1d8b6dbcb93ff99e0ad13004bd209 Description: File manager and graphical shell for Cinnamon Nemo is the official file manager for the Cinnamon desktop. It allows to browse directories, preview files and launch applications associated with them. It is also responsible for handling the icons on the Cinnamon desktop. It works on local and remote filesystems. . Several icon themes and components for viewing different kinds of files are available in separate packages. Original-Maintainer: Nicolas Bourdaud <[email protected]> Homepage: http://www.github.com/linuxmint/nemo/ -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1341292 Title: nautilus don't liberate the memory Status in “nautilus” package in Ubuntu: Confirmed Bug description: nautilus (3.10.1-0ubuntu8,3.10.1-0ubuntu9.1) don't liberate then memory I use Ctrl ++ to increase the images exemple directory Rep:: 616 photos (2,1 Gio) open Nautilus on this directory Rep , Ctrl +++++++ , close nautilus memory occuped by nautilus : 527Mio ...... I redo this (five times) open Nautilus on this directory Rep , Ctrl +++++++ close nautilus memory occuped by nautilus : 2,8Gio the six time : nautilus is killed by the system ( because memory occuped more 80% ) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: nautilus 1:3.10.1-0ubuntu9.1 ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2 Uname: Linux 3.13.0-30-generic i686 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: i386 CurrentDesktop: Unity Date: Sun Jul 13 15:47:03 2014 ExecutablePath: /usr/bin/nautilus GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-visible-columns' b"['name', 'size', 'type', 'date_modified', 'permissions', 'where']" b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']" InstallationDate: Installed on 2014-05-25 (48 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417) ProcEnviron: LANGUAGE=fr_FR PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: nautilus UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1341292/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

