I have almost the exact same problem, every time I join an Arena I get uber FPS spikes.
It's definitely got nothing to do with my PC, I can login both my account and my wifes account simultaniously and run around Pandaria with no lag.
Strangely it doesn't happen in every arena, but about 4/5 arenas it spikes to the point that it isn't playable.
It seems not many people are having this issue... I've tried disabling all settings in Oqueue and no luck.
The only solution I have is to find a group, logout and disable the addon and log back in before the person I invited leaves the group.
It's really a shame because it seems to be a great addon but it's near enough completely broken for me.
It's definitely got nothing to do with my PC, I can login both my account and my wifes account simultaniously and run around Pandaria with no lag.
Strangely it doesn't happen in every arena, but about 4/5 arenas it spikes to the point that it isn't playable.
It seems not many people are having this issue... I've tried disabling all settings in Oqueue and no luck.
The only solution I have is to find a group, logout and disable the addon and log back in before the person I invited leaves the group.
It's really a shame because it seems to be a great addon but it's near enough completely broken for me.