Throughout time immortal (haha) we've been advised to disable file
caching/op-locking on NetWare. I know that every time Novell's said
that they've fixed it, they haven't.

So with NW 6.5 SP5 and 4.91 SP2c clients, is it finally fixed?

Does it really improve performance if it's on (it's always caused
problems for us in the past when a support pack "turned" the setting
back on--files were never closing properly, etc.)