Get-adgroupmember gives operation timeout error

Question

Hi experts,
i am tring to get the user names from few groups in AD. But it displays me an eror for few groups like
ERROR :-
At D:\All Scripts\AD Scripts\groupmember.ps1:7 (file:///D:/All%20Scripts/AD%20Scripts/groupmember.ps1:7) char:1
+ Get-ADGroupMember vpn_terminal_access | Foreach-object{
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : O
perationTimeout: (vpn_terminal_access:ADGroup)
[Get-ADGroupMember], TimeoutException
+ FullyQualifiedErrorId : ActiveDirectoryCmdlet:System.TimeoutException,Mi
crosoft.ActiveDirectory.Management.Commands.GetADGroupMember
SCRIPT -
Get-ADGroupMember ABC | Foreach-object{
   $_.samaccountname | get-aduser -properties * | Ft name, emailaddress | out-file .\ABC.csv -enc utf8 -append
ABC is group name. What i need to do ?

Answer 1

Doesn't matter. The user principal is very easy to get.  It is the embedded Get-AdUser that is time consuming because it mkes Get-AdGroupMember wait on every member.  If any member is in another domain and the network is slow it can cause a timeout. 
Yes= Using Get-ADGroup would be faster but it, too, returns an array of strings and NOT a comma delimited list.
Under most circumstances the difference is trivial.  If the domains are remote then this is an issue.  One more reason to not place users in a group when remote. Place them in a group and place the group in the group.  Overall performance
for everything is better and more reliable.  That is why it is designed that way.  In NT4 this was not as easy so NT4 was prone to this kind of failure. Too often Admins just add users to local groups when they are remote. They then complain about
performance. It can very badly impact logon performance.
Notice that this is a collection (array):
PS C:\scripts> (Get-AdGroup testgrp -prop members).members.GetType()
IsPublic IsSerial Name BaseType
True False ADPropertyValueCollection System.Collections.CollectionBase
For this property only it is a collection of strings. It can be a collection of any "ValueType"
¯\_(ツ)_/¯"