This is patently false. FUD. And you need to stop repeating it. There are people I’ve seen running ZFS with incredibly low amounts of ram. In the megabytes. Will it perform well? Depends on what it’s doing. But it can run acceptably in low memory situations.
Even if it didn’t you act like ram is expensive. Everyone that complains it takes too much ram needs to get a job. Seriously ram is cheap it’s not 1970.
I think those people that complain about Freenas have no idea what the problems actually are. Samba itself has never been a performance demon. But that’s not why people use it. But to claim it’s freenas that’s slow is redonkulous.