Large DL in Exchange 2010 takes a long time to enumerate

Not sure if this is normal but I have a Distribution List with all employees and it contains just under 2800 mailboxes. When I am going to add a user to this list using the Exchange Console, it takes about almost 3 minutes to enuerate the list. You can't do anything with it until this is done. I thought maybe the first time it would take a while and then subsequent times it would speed up but not the case.

Every time I click on the Members tab it takes almost 3 minutes to enumerate all the users. 2800 is not a lot so I can't image a list of 10,000 and how long that would take.  Other smaller DL's of course have no issue. Just want to know if this is normal. There are no warnings or errors in the Event Log. Running Exchange 2010 SP3 RU1. We have plenty of local DC's running 2008 R2 x64. Just didn't know if this is an Exchange thing. I thought it was too long.
shadowtuckAsked:
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AmitIT ArchitectCommented:
GUI Interface could take time to load. Use command let Powershell.
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shadowtuckAuthor Commented:
Not always convenient to use PS especially with Help Desk that only know the GUI. Just trying to find out if this delay is normal or do I have a problem.
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AmitIT ArchitectCommented:
It depends you DC connectivity. As Exchange fetches lot of information from AD. Run Exbpa and check if you see any dc related errors.
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Simon Butler (Sembee)ConsultantCommented:
Doesn't surprise me that it takes a long time. Check the properties of the group in ADUC to see whether a specific domain controller has been selected as the expansion server.

As a rule I never have a group with all users in it. I will usually build a nested list of groups. It makes management much easier.

Simon.
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shadowtuckAuthor Commented:
I don't think its a DC connectivity thing. We have 3 local x64 bit DC's and our backbone is 10GB. I just think it's the way Exchange enumerates the users. Since 2010, just granting a user Full Access or Send As takes longer than 2007. No expansion server. We only have two local CAS servers and they are both practically asleep they are so under used. I'll have to come up with PS commands for the Help Desk I guess.
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AmitIT ArchitectCommented:
2010 EMC is not that great. That's why MS discontinued in 2013. PS is the future for MS products.
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