whitelist_from and spamd performance

[Paolo Cravero as2594 <pc...@as2594.net>]

Hi.
Just a though: should I expect any spamd performance increase if I move 
the whitelist_from list from default_prefs to local.cf?

To my understanding local.cf is read only once, when spamd is loaded, 
while default_prefs are intepreted at every spamc call. Right?
If so, in a sitewide environment, every parameter should be moved to 
local.cf, shouldn't it?

I'm running spamassassin 2.62 with sitewide configuration for multiple 
domains, in spamc/spamd fashion.

Thanks,
Paolo