[Zope] LDAP UserFolder with dead slow LDAP server

[huima at huima.net]

Hi all,
we are facing few problems with LDAP UserFolder in cases where
authentication from the server takes long - even 20 seconds. For that time
the thread of Zope naturlly freezes to wait for the server to return data.
This is problematic since the centraliced LDAP-server will for sure return
a lot of the queries in that fashion - and we really can't have the
application to freeze down if X number of users try to login.
Has anyone implemented anything that would come over similar problems with
external authentication sources?

-huima