How can I keep second NIC issolated in Zima

I am running the ZimaOS box has 2 NICs, I want to keep them isolated. As in I want to use eth0 for Zima and it’s shares, and use eth1 for VM’s and maybe Frigates streams for recordings.

But it seems when I have both pugged in it slows down transfer speeds on Zima.

I am chooseing the Bridge eth0 on the VM’s settings but how can I keep Zima from using it too?