Hi Berni,
Thanks for your reply. I've just tried manually mounting volumes from our NetApp NAS and other NAS units and you are right in that the mount is slow. So it's not AutoFS that's slow, it is the underlying mount that's slow.
I've tested some reverse lookups for the openSuse11.1 machines and they return an immediate correct response so that's not our problem.
Looks like there is a serious mount issue. This isn't fixed by any of the updates either.
Neil