dunno whats wrong with Quest.GetQuestCompleted(questID)
i put in quest Complete condition "return Quest.GetQuestCompleted(12345);"
this cause bot lag every second for 0.5-0.7s
changed to return Lua.LuaDoString<bool>("return IsQuestFlaggedCompleted("+ questID + ")") and lag disappear.
this is maybe my character completed alot of quests? i dont almost everything what i can