The time required to reclaim (recycle) space in the cache increases
linearly with the number of chunks. A memory-based cache does not
usually improve performance; it was implemented solely to support
diskless workstations.
I'm pretty sure that you can "spiff up response" through appropriate
tuning, but acheiving optimal performance requires some study and
analysis.
Are you presently tuning any of the afsd switches? Using "rc.large",
for instance? If not, then I can definitely guarantee some
improvements. If so, try also adding "-files 2800".
Do your users log out and log in frequently? If so, consider adding
"unlog" to their logout procedure.
