need help for webproxy setting

hi all ,
i m little bit confused to configure web proxy.

i can not understand abt max-ram-cache-size ,max-cache-size, reserved-for-cache
and reserved-for-ram-cache.

how can i set (calculate) max ram cache size.

i read manual they said if u have memory less than 60 MB u can’t enable webproxy.

in routerboard 333 in system–>resources—>general—>memory

total memory is 60.9 MiB and
free memory is 45.3 MiB
MiB means megabytes?

whats the advantage of webproxy?

plz i need help to sort it out this problem.

thanx in advance
james

to do a Caching in Routerboard is NOT a good suggestion, But you can do lot many stuff with WebProxy