perf: pre-allocate raid unit tokens to optimize HealBot_FindUnitID performance

HealBot.lua

@@ -222,25 +222,26 @@ end
 
 -- SpiBonus and GetBonus functions moved to HealBot_Controller_Spells.lua
 
+local HealBot_RaidUnitTokens = {}
+for i=1, 40 do HealBot_RaidUnitTokens[i] = "raid"..i end
+
 -- HealBot_FindUnitID: Finds a unit token for a given player name.
 function HealBot_FindUnitID(unitname)
   local text;
-  for _,unit in ipairs(HealBot_Action_HealGroup) do
-    text = UnitName(unit);
-	if text then
-	  if text==unitname then
-	    return unit;
-	  end
-	end
-  end
-  for i=1,40 do
-    local unit = "raid"..i;
-	text = UnitName(unit);
-	if text then
-      if text==unitname then
+  if HealBot_Action_HealGroup then
+    for _,unit in ipairs(HealBot_Action_HealGroup) do
+      text = UnitName(unit);
+      if text and text==unitname then
         return unit;
       end
-	end
+    end
+  end
+  for i=1,40 do
+    local unit = HealBot_RaidUnitTokens[i];
+    text = UnitName(unit);
+    if text and text==unitname then
+      return unit;
+    end
   end
   return nil;
 end

README.md

@@ -49,6 +49,9 @@ Default installation path: `C:\Program Files\World of Warcraft\Interface\AddOns\
 
 ### Change Log
 
+**v1.7.4**
+* **Performance Fix - Unit ID Lookup** - Optimized `HealBot_FindUnitID` by pre-allocating raid unit tokens, preventing massive string concatenation and garbage collection spam during high-frequency combat events like `CHAT_MSG_ADDON` (HealComm).
+
 **v1.7.3**
 * **Performance Fix - Table Pooling Part 2** - Fixed remaining un-pooled table allocations in layout updates, macro parsing, nampower integration, and aura tracking by utilizing HealBot_GetTable().
 * **Performance Fix - HealComm Networking** - Fixed issue where incoming `HealComm` messages triggered synchronous UI redraws, causing massive lag in 40-man raids during combat. `HealBot_RecalcHeals` is now decoupled and deferred through the `HealBot_OnUpdate` dirty queue, allowing multiple network events to collapse into a single frame redraw.