PutEx - add\remove or just replace

I'm writing some scripts that will update some distribution groups.  In these scripts I'm generating an array that has all the DN's of the correct list of members and then comparing that with the current membership of the group.  Some of these groups are VERY large, as in well over 1,500 members.  The goal being to make the group membership match the 'correct' list that I generate originally.

My question is with PutEx and the efficiency from an Active Directory perspective with regards to using the add\remove operations of PutEx (3 and 4) vs. just replacing the entire membership (2).

Is there such a big different in efficiency (and perhaps replication) if I'm editing large lists where I should use the add\remove operations vs. just using replace?
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Chris DentConnect With a Mentor PowerShell DeveloperCommented:

Depending on the functional level of your forest (at least 2003), and the operational level of the group (not all groups have this enabled, depends when the group was created). But in theory, PutEx 3 / 4 should be far more efficient than replacing the entire list.

This is making a few assumptions about the efficiency of LVR (Linked Value Replication) when the majority of the contents do not change, but it's about the only aspect that's going to come into play here.

If your functional level is lower then the entire member attribute will replicate regardless of the number of changes. If LVR is in operation it should only replicate the change to the attribute (not the entire attribute).

HTH

Chris
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