You mean that wikientry? http://wiki.archlinux.org/index.php/Speed-up_Firefox_using_tmpfsI did this to test how well tmpfs works for me: mv .mozilla /dev/shm/moz ln -s /dev/shm/moz .mozilla There was some difference, but not too much as expected.
From what I understand this is to keep the disk from spinning up, I use (a modified version) of this on my laptop.
Christoph
