Noatime affects how often the system updates your time in your
computer. This is a significant loss in speed according to the kernel
Devs.
To speed it up do the following modifications.
Edit your fstab file and back it up (Run following commands in the
terminal)
su -c 'cp /etc/fstab /etc/fstab.backup'
su -c 'gedit /etc/fstab'
Where the mount option says defaults you should append some more text.
search for this line adn edit it...
ori
/dev/mapper/vg_rohan-lv_root / ext4
defaults 1 1
modded
/dev/mapper/vg_rohan-lv_root / ext4
defaults,noatime,nodiratime 1 1
Notice the only modification is to the lines that mount my default
partitions. After the editing has been completed you will need to
restart your computer for it to take effect. If you don’t wish to
reboot the computer, you may also remount the partitions of the live
system.
(read from
http://digitizor.com/2009/01/31/fedora-speed-tweaks-make-fedora-faster/)