How to increase networking performance between 2 Linux VM's on the same host & bridge

I'm trying to increase the networking performance between 2 Linux VM's on the same Proxmox host and bridge. I've tried both a Linux bridge and OVS bridge. I've tried increasing MTU to 900o and multiqueue to 4. I can't seem to get above 25-30Gbps between the VMs. I'm running these VM's on an EPYC 7443p system and when I monitor the cpu during the testing, CPU is not even 25% utilized. I've tried testing with iperf (version 2), iperf3, NFS file transfers (very slow), and SMB file...

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