I am trying to use NT Domain authentication with a Zope 2.7 install on win2k. My old situation was Zope 2.3.2 installed on a Windows NT 4.0 BDC, with LoginManager and my own login methods to authenticate to the host machine. The performance was fine. On the install I am hoping to migrate to, exUserFolder and the smbAuthSource works but it is _really_ slow. I am now authenticating to a remote BDC as opposed to the same machine, but by remote I mean on the same 10/100/1000 LAN, so that really shouldn't be a performance bottleneck. Looking at the code, there is no caching that I am aware of and so it uses some of the calls to the PDC once for every object. Pages below the exUserFolder take 4-5 seconds to load, where those not going through it load in <1 second (same page used for testing). I am thinking of maybe using one of the other user folders out there that use caching (MySQLUserFOlder, LDAPUserFolder) as a template to make my own, but if someone has a better idea... thanks.