[Zope] Zope and Windows NT 2000

Hello, i'm testing Zope 2.1.6 with Windows NT 2000. Everything is running fine but... it's slow updating the internal database. Each time you press the "Change" button the wait is 30 seconds! On the same machine with Windows98SE and Linux there is no wait. All the other operations are working without any problems of speed. Is there anyone else who tried Zope with Nt2000? Thanks, Bruno