I have a similar problem to the one under this question: What is tumblerd?
That program is one of the most CPU hungry I ever seen in Xubuntu/Xfce. I do not really need thumbnails preview and I might just uninstall it.
sudo apt-get remove tumbler
But I get:
The following packages will be REMOVED:
tumbler xubuntu-desktop
Isn't that my desktop?
EDIT AFTER SOLVING THE MEMORY PROBLEM:
I would like to know the answer to this question, but considering the initial reason for removing tumbler: removing tumbler is not necessary.
The sudden memory use is related to video thumbnails, and that only for videos that are moved, downloaded etc.
To completely disable thumbnails, open a Thunar window, Edit-Preferences-Show thumbnails:Never.
To disable them for video files only, edit /etc/xdg/tumbler/tumbler.rc
changing the lines Disabled=false
to Disabled=true
under 'Video Thumbnailers' section.
Best Answer
xubuntu-desktop
is a dummy package that installs things that the Xubuntu desktop needs. If it would delete other packages those would have been listed too.dependencies for tumbler.
Feel free to remove that package.