[squid-users] Optimum Number of Redirectors

Greetings,

How do I determine the optimum number of redirector processes to use?
The FAQ says:

Caution
If you start too few Squid will have to wait for them to process a back =
log of URLs, slowing it down. If you start too many they will use RAM =
and other system resources.

So what is too few or too many? Is it just trial and error?

I'm running Squid2.5 Stable3 on Linux/Dell 350 with 1GB or Ram
Using Perl redirectors.

Is there some ballpark figure i.e. between 10 - 32 , etc.

Thank you,
John Kent