Configuration:

Ubuntu 12.04
Openstack Grizzly 
Openstack Networking with OVS plugin

Everything seems to be working ok. I can launch and connect to the instance but I notice that the more I have instances running, the more the "nova" command and the dashboard responses becoming very slow. One thing I noticed was the beam.smp CPU usage is most of the time 100% and I have seen it went up to 500%. I think this is contributing to the performance I am seeing.

I installed the management plugin to check the status of rabbitmq-server and everything seems to be normal. Resources available are way more than the current usage.
Here's the output of the "rabbitmqctl report | grep A3 file_descriptors".

{file_descriptors,
 [{total_limit,9900},
  {total_used,259},
  {sockets_limit,8908},
  {sockets_used,257},

I was running the rabbitmq version that came with Ubuntu 12.04 and I upgraded it to ver 3.1.1-1 to test if that would help solve the problem, but same bproblem. Does anyone have seen this behavior? Thanks for any help that you can provide.