memberOf attribute indexing

["George Holbert" <gholbert@broadcom.com>]

Hello,

For a bdb-backend server that utilizes slapo-memberof and services 
searches filtered on memberOf,
is it beneficial to configure indexes for the memberOf attribute?

In other words, is memberOf stored pretty much like any other attribute, 
or is it computed dynamically on every search (making it "un-indexable")?

Thank you for your time!
-- George