Sabayon, the distro I’m currently using, recently started grinding to a halt. The cause of this was the tracker-store which, when it starts indexing my hard drive, sucks up resources (mainly memory) until nothing is left for any other application.
Killing the process solves the immediate issue but, to prevent it recurring, my first thought was to go to the Tracker settings (System > Preferences > Search and Indexing) and disable the indexing options.
This failed, so I turned to the Start Up applications (System > Preferences > Startup Applications) and switched off all of the Beagle and Tracker Applications. This, of course, means that nothing is being indexed, which is fine since I don’t use this functionality.
It would be better to remove the app altogether, but Sulfur tells me that there are a fair few dependencies on this and I want to avoid breaking anything else. That said, if it the workaround fails, uninstalling the Tracker will be my next option.