[Zope] ZMI very slow on Win 2000 server

Hi, I'm running the binary release of Zope 2.6.1 (python 2.1.3) and Plone 1.4 on a Windows 2000 sp4 server on the local network. Recently, I've noticed that the ZMI has slowed almost to a crawl while viewing the contents of most folders (empty ones open quickly). I can't think of anything that has been changed recently in our config. Things I've tried: clearing the cache, compacting the database, restarting the server. I'm just getting started with Zope, so I would appreciate some pointers on other troubleshooting things I can try. Thanks, Michael