I agree with you that being able to rebuff instantly in combat mode is not normal. The biggest issue we have with that is not having a more refined config to force players to wait for combat mode to end inside a pvp zone.
We recently tried eliminating the community board functions in pvp zones...
Yes, we are aware of the lag. We knew the updates may cause some issues. We are working on a few settings that may pinpoint the problem.
In the worst case, we can always revert back to the previous installation. Bear with us guys.