for instance from the man page...
Do not update the file access time when reading from a
file. This option is useful on filesystems where there
are large numbers of files and performance is more criti-
cal than updating the file access time (which is rarely
ever important). This option is currently only supported
on local filesystems.
This could be put on htdocs slice.
I use noatime on /usr/obj ; /usr/src . And I can tell a HUGE difference in speed with this option. Theres tons more options that might be helpfull for lj.