Put a throtle on the UpdateBars function, reducing CPU usage to about 20%-40% compared to before, with no loss of threat updates (more savings when in a larger raid).

Omen.lua

@@ -1313,8 +1313,19 @@ function Omen:FindThreatMob()
 	self.unitID = nil
 end
 
-local queried = false
+-- Frame for throtling updates
+local OmenUpdateBarsThrotleFrame = CreateFrame("Frame")
+OmenUpdateBarsThrotleFrame:Hide()
+OmenUpdateBarsThrotleFrame:SetScript("OnUpdate", function(self, elapsed)
+	self:Hide()
+	Omen:UpdateBarsReal()
+end)
 function Omen:UpdateBars()
+	OmenUpdateBarsThrotleFrame:Show()
+end
+
+local queried = false
+function Omen:UpdateBarsReal()
 	if db.Autocollapse and db.CollapseHide then
 		-- Update the visibility because it could have been hidden on 0 bars
 		self.BarList.barsShown = 1 -- Dummy value
@@ -1325,8 +1336,6 @@ function Omen:UpdateBars()
 		return
 	end
 
-	-- TODO: Put a update throtle on this function
-
 	local myGUID = UnitGUID("player")
 	local dbBar = db.Bar
 	local mob, mobGUID, mobTargetGUID