Okay it took me about 4 days to figure out what was causing my lag issues after afking out of a battleground or just going afk from not moving my character.
I disabled everything and went one by one and it is definitely KillingFields.
After afking in a bg, upon loading into IF my screen stutters and I am unable to right click on people's portraits to inspect, trade, or invite them to group. This also affects the ability of switching from Poor, Common, Uncommon, Rare, and Epic in the Auction house. Any right click function that uses a list is unable to be accessed. I noticed this on the Test realm, but never took the time to figure out which mod was causing it.
The only work around is to constantly do /console reloadui.
I am using the latest version 0.9. I am hoping that someone else is experiencing this, so that I know it is not just my bad luck. haha