Back color configurable, added fps counter checkbox

Editor/Core/SplashSettings.cs

@@ -136,6 +136,19 @@ namespace SplashEdit.EditorCode
             set => EditorPrefs.SetBool(Prefix + "MemoryOverlay", value);
         }
 
+
+        // --- FPS Overlay ---
+        /// <summary>
+        /// When enabled, compiles the runtime with an FPS counter
+        /// and text overlay at the top-left corner of the screen.
+        /// Passes FPSOVERLAY=1 to the native Makefile.
+        /// </summary>
+        public static bool FpsOverlay
+        {
+            get => EditorPrefs.GetBool(Prefix + "FpsOverlay", false);
+            set => EditorPrefs.SetBool(Prefix + "FpsOverlay", value);
+        }
+
         // --- Export settings ---
         public static float DefaultGTEScaling
         {