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The work to "make Ubuntu fit on mobile" has advantages for the desktop users and recently, some changes have landed in Ubuntu 13.04 Raring Ringtail (currently under development) which should reduce the memory used by some default packages.

For instance, a recent GTK3 update comes with a patch to "only load CSS image data when needed, saving a substantial amount of memory". Other such changes include:
  • several memory leaks have been fixed for libdbusmenu, update-notifier, upower, whoopsie and more;
  • LightDM PPS has dropped from 25.7M to 0.6M;
  • some processes were changed to exit-on-idle and be restarted-on-demand rather than running all the time (signond, signon-ui);
  • some GNOME Settings Daemon plugins were turned off by default for the desktop (and even more for the Nexus setup);
  • GNOME Online Accounts is no longer installed by default since it's not used by Unity (it's only required by GNOME Shell);
  • code optimization in several desktop services.

According to the Ubuntu Devel mailing list, the memory optimizations performed for Nexus (which include the desktop components mentioned above) has resulted in a drop for the idle memory usage from 600M to 400M. The change probably isn't so drastic for the desktop, but it's nevertheless an important step in the right direction.


Besides these under-the-hood changes, there are also two new default indicators in Ubuntu 13.04 Raring Ringtail: 
  • you're probably familiar with the first one: Sync Menu, an indicator which right now only supports Ubuntu One but later it might support other services such as Dropbox. The indicator has been available starting with Ubuntu 12.10, but it wasn't added by default until now. For now, it can be used to enable/disable Ubuntu One sync, display current and recent transfers or share files, but more features should be available in the future, according to THIS Ubuntu wiki page;
  • the second new default indicator is a Bluetooth Indicator,  which should replace the old Bluetooth Indicator that is provided by a distro patch over the fallback icon of gnome-bluetooth (the old Bluetooth Applet fallback icon will be dropped along with the whole fallback mode with GNOME 3.8). For now there are two bluetooth icons displayed on the top panel, but the Bluetooth Applet will probably be built without AppIndicator support soon to fix this.

Sync Menu (indicator)
Sync Menu (indicator)

New Bluetooth Indicator
New Bluetooth Indicator

I also have to mention that Ubuntu 13.04 Raring Ringtail is the most stable Ubuntu development version I've used so far. Up until now, I've only encountered one nasty bug with Intel graphic cards that was fixed a while back.

If you want to give it a try, you can download the latest Ubuntu 13.04 Raring Ringtail daily ISO from HERE. But, even though it feels quite stable, Ubuntu Raring Ringtail is still in development so things can break! Don't use it on production machines!
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