diff --git a/OpenRA.Game/Traits/RevealsShroud.cs b/OpenRA.Game/Traits/RevealsShroud.cs
index 36ade2425d..bb6a5d52ff 100644
--- a/OpenRA.Game/Traits/RevealsShroud.cs
+++ b/OpenRA.Game/Traits/RevealsShroud.cs
@@ -28,6 +28,8 @@ namespace OpenRA.Traits
 		
 		public void Tick(Actor self)
 		{	
+			// todo: don't tick all the time.
+
 			if (previousLocation != self.Location)
 			{
 				previousLocation = self.Location;
diff --git a/mods/ra/maps/koth-crossroads.oramap b/mods/ra/maps/koth-crossroads.oramap
index 2c30686581..331561eef5 100644
Binary files a/mods/ra/maps/koth-crossroads.oramap and b/mods/ra/maps/koth-crossroads.oramap differ
diff --git a/mods/ra/maps/koth-island-hoppers.oramap b/mods/ra/maps/koth-island-hoppers.oramap
index d518e76177..dc4f160bb6 100644
Binary files a/mods/ra/maps/koth-island-hoppers.oramap and b/mods/ra/maps/koth-island-hoppers.oramap differ
diff --git a/mods/ra/maps/nuclear-winter.oramap b/mods/ra/maps/nuclear-winter.oramap
deleted file mode 100644
index 87a1eb11e9..0000000000
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