Originally Posted by MonsterMMORPG
it can be cumulative lag of several addons
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Normal addons shouldn't cause noticable lag while doing nothing though. Most should only do things on demand.
Mostly using the combat events can cause major performance decrease. Some addons do a lot of stuff for each event in which can cause huge performance issues if they add up.
That's why I asked if it lags all the time or only e.g. while fighting or beeing near people fighting. And do you mean the addon Advaced UI? Because that updated recently and maybe that started your problems then.