Had similiar problems (completly broken perfomance after upgrading on a virtio nic on proxmox, in my case mostly natting)
I got the tipp on irc to disable the HW offloading, which needs assigned and enabled interfaces to the parent interfaces (which I didn't have because I had only subinterfaces due to VLANs), which fixed the problem. Seems to be a problem with freebsd 13.
I got the tipp on irc to disable the HW offloading, which needs assigned and enabled interfaces to the parent interfaces (which I didn't have because I had only subinterfaces due to VLANs), which fixed the problem. Seems to be a problem with freebsd 13.