Optimize pacman and free space on Arch
The pacman cache is a folder containing compressed packages that you’ve downloaded – including older versions, e.g. you’ll have somepackage.0.1.1, somepackage.0.1.2 and somepackage.0.1.3, etc It can be very useful if something breaks and you need to revert to an earlier package. But it also takes up a lot of space! I was able for free up about 4GB of space on my box by doing this:
pacman -Sc This clears outdated/uninstalled packages.
I got another 1GB freed by running
pacman -Scc This clears the whole folder, not just the packages that are outdated/uninstalled.
Optimise the pacman database (good to do from time-to-time!)
pacman-optimize && sync
This will attempt to put all the small files together in one (physical) location on the hard disk so that the hard disk head does not have to move so much when accessing all the packages.
http://wiki.archlinux.org/index.php/Improve_Pacman_Performance
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