Openvswitch system interfaces cpu bound

Is anyone familiar with the open vswitch package?

It seems as configured traffic between physical ports on the same tag/vlan are cpu bound.

I get high packet loss, only 3mbps from system interface to system interface, but 1Gbps between system interface and an internal interface.

When i attach the same physical ports to a bridge that is also connected to the internal interface, i get 1G between everything.