diff --git a/libs/libthrottle.lua b/libs/libthrottle.lua
index 8b9241d6..b61621aa 100644
--- a/libs/libthrottle.lua
+++ b/libs/libthrottle.lua
@@ -33,6 +33,7 @@ libthrottle.presetNames = {
 libthrottle.defaults = {
   nameplates           = "custom",
   nameplates_target    = "custom",
+  nameplates_castbar   = "custom",
   nameplates_mass      = "custom",
   tooltip_cursor       = "custom",
   chat_tab             = "custom",
@@ -159,6 +160,7 @@ libthrottle:SetScript("OnEvent", function()
     -- Set defaults for custom fields if missing
     if not _G.pfUI_throttle.nameplates_target_custom then _G.pfUI_throttle.nameplates_target_custom = "50" end
     if not _G.pfUI_throttle.nameplates_custom then _G.pfUI_throttle.nameplates_custom = "10" end
+    if not _G.pfUI_throttle.nameplates_castbar_custom then _G.pfUI_throttle.nameplates_castbar_custom = "50" end
     if not _G.pfUI_throttle.nameplates_mass_custom then _G.pfUI_throttle.nameplates_mass_custom = "7" end
     if not _G.pfUI_throttle.tooltip_cursor_custom then _G.pfUI_throttle.tooltip_cursor_custom = "10" end
     if not _G.pfUI_throttle.chat_tab_custom then _G.pfUI_throttle.chat_tab_custom = "10" end
diff --git a/modules/gui.lua b/modules/gui.lua
index 80cb5091..753072d5 100644
--- a/modules/gui.lua
+++ b/modules/gui.lua
@@ -1765,7 +1765,43 @@ pfUI:RegisterModule("gui", "vanilla:tbc", function ()
       local spacer2 = CreateConfig(nil, " ", nil, nil, "header")
       spacer2:GetParent().objectCount = spacer2:GetParent().objectCount - 1
       spacer2:SetHeight(5)
-      
+
+      local castbarCustom
+
+      CreateConfig(function()
+        if castbarCustom and castbarCustom.input then
+          local isCustom = pfUI.throttle:IsCustom("nameplates_castbar")
+          if not isCustom then
+            castbarCustom.input:EnableMouse(false)
+            castbarCustom.input:EnableKeyboard(false)
+            castbarCustom.input:ClearFocus()
+            castbarCustom.input:SetTextColor(.5,.5,.5,1)
+            castbarCustom.input:SetText(tostring(pfUI.throttle:GetFps("nameplates_castbar")))
+          else
+            castbarCustom.input:EnableMouse(true)
+            castbarCustom.input:EnableKeyboard(true)
+            castbarCustom.input:SetTextColor(.2,1,.8,1)
+            if _G.pfUI_throttle.nameplates_castbar_custom then
+              castbarCustom.input:SetText(_G.pfUI_throttle.nameplates_castbar_custom)
+            end
+          end
+        end
+      end, T["Castbar Plates"], _G.pfUI_throttle, "nameplates_castbar", "dropdown", {
+        "very_slow:" .. T["Very Slow"] .. " (2 FPS)",
+        "slow:" .. T["Slow"] .. " (5 FPS)",
+        "normal:" .. T["Normal"] .. " (10 FPS)",
+        "fast:" .. T["Fast"] .. " (20 FPS)",
+        "very_fast:" .. T["Very Fast"] .. " (30 FPS)",
+        "fastest:" .. T["Fastest"] .. " (50 FPS)",
+        "custom:" .. T["Custom"],
+      })
+
+      castbarCustom = CreateConfig(nil, T["Custom FPS"], _G.pfUI_throttle, "nameplates_castbar_custom")
+
+      local spacer3 = CreateConfig(nil, " ", nil, nil, "header")
+      spacer3:GetParent().objectCount = spacer3:GetParent().objectCount - 1
+      spacer3:SetHeight(5)
+
       local massCustom
       
       CreateConfig(function()
diff --git a/modules/nameplates.lua b/modules/nameplates.lua
index 7957861b..6a750af6 100644
--- a/modules/nameplates.lua
+++ b/modules/nameplates.lua
@@ -1279,17 +1279,27 @@ nameplates:RegisterEvent("ZONE_CHANGED_NEW_AREA")
     local isCasting = nameplate.castbar and nameplate.castbar:IsShown()
     
     local throttle
-    if target or isCasting then
+    if target then
       throttle = pfUI.throttle:Get("nameplates_target")  -- Default: 50 FPS
     elseif visiblePlateCount > 20 then
       throttle = pfUI.throttle:Get("nameplates_mass")    -- Default: 7 FPS for mass pulls
     else
       throttle = pfUI.throttle:Get("nameplates")         -- Default: 10 FPS
     end
-    
+
+    -- castbar has its own throttle (independent of target throttle)
+    local castbarThrottle = pfUI.throttle:Get("nameplates_castbar")  -- Default: 20 FPS
+    local castbarReady = (nameplate.castLastTick or 0) + castbarThrottle <= now
+    if nameplate.castUpdate and castbarReady then
+      nameplate.castLastTick = now
+    elseif nameplate.castUpdate and not castbarReady then
+      nameplate.castUpdate = nil  -- defer castUpdate until castbar throttle allows it
+    end
+
     -- Check for pending event updates (these bypass throttle for immediate response)
+    -- castUpdate is now handled by its own throttle above, not the general bypass
     local hasEventUpdate = nameplate.eventcache or nameplate.auraUpdate or nameplate.castUpdate or nameplate.targetUpdate or nameplate.comboUpdate
-    
+
     -- Event updates bypass throttle
     if not hasEventUpdate and (nameplate.lasttick or 0) + throttle > now then return end
     nameplate.lasttick = now