Whenever I run SetAchievementComparisonUnit api, WoW will lag about 0.5 second. I am the author of O Item Level addon which have the feature to check raid progression of raiders in raid / party. If I set it to auto track all members, I will get serious lag. I see fps loss about 20 fps or more.
Even if I don load any addon, I /run SetAchievementComparisonUnit("player"), will get a 0.5 sec lag. Why?