SA with or without amavis-new - whats faster?

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http://serverfault.com – Currently i have working setup of postfix with virtual users which uses amavis (with SA and clamav) to filter messages. The problem is, i need to allow every user to be able to adjust their SA settings. So i need to store SA settings in a database. Its quite simple to do when SA runs without amavis, but is it ever possible to force SA and amavis to use database? If not, what will be performace influence when i drop amavis and use SA directly with postfix? (HowTos)