Active Directory - Search filter optimization

Hello Experts,

I'm building an ASP.NET webpage that pulls the users info via Active Directory.  Right now it's working, but slower than I'd like.  So I'm trying to optimize my search filter in hopes of speeding up the search.  Right now my search filters is setup like so:

Mysearcher.Filter = "(&(objectCategory=person)(objectClass=user)(samAccountName=" & strNetworkID & "))"

Can anyone help me to tweak this for faster performance?

Thanks,
Moe
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mauricerichardAsked:
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mrfixit584Commented:
The filter is pretty much as lean as it can be. The question is, how much of the tree are you searching, and do you need to search the entire tree? If all of your users are in a sub-OU, you could restrict your search to that OU instead of searching the entire structure.
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mauricerichardAuthor Commented:
Hi Mrfixit584,

I'm struggling with Active Directory, so pardon any silly questions.  
Where would I indicate this, in the search filter or DirectoryEntry?

See code sample for examples

Thanks,
Moe
Mysearcher.Filter = "(&(objectCategory=person)(objectClass=user)(samAccountName=" & strNetworkID & "))"

'OR

Dim rootEntry As New DirectoryEntry("LDAP://domain/DC=domainDN,DC=com", "username", "password")

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mrfixit584Commented:
It would be part of the LDAP call. instead of LDAP://dc=domain,dc=com, make it more specific. LDAP://ou=myOU,dc=domain,dc=com. For some of my searches, this isn't possible, but if the objects you are searching are in a certain location, you can specify the location so the search doesn't include the entire domain.
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mauricerichardAuthor Commented:
Sorry been away from the office.  Great info, thanks very much!
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