[neutron] api performance at scale

Is there a SIG or similar discussion on neutron performance at scale? For us nova used to be the biggest concern, but a lot of work has been done and nova now performers great. Instead we are having issues to get Neutron to perform at scale. Obvious calls like security groups are performing really poorly, and nova-compute defaults for refreshing the network cache on computes causes massive issues with Neutron. Best Regards, Erik Olof Gunnar Andersson