[Tilesathome] Use of ramdisk for temporary directories?

[OJW]

There was suggestion on IRC to use /dev/shm as a temporary directory for 
unzipping uploads - any comments on whether this is a good idea?



(my impression was: disk "hdd" which houses everything used in the unzip 
process (the zip files, the temporary directory, and the final image 
directory) has 20% the throughput compared to disk "hda" which isn't involved 
in the unzip process at all, so disk access for the unzip operation is 
unlikely to be a bottleneck)