diff --git a/OpenRA.Game/Actor.cs b/OpenRA.Game/Actor.cs
index 89d9a4c743..15d240380a 100644
--- a/OpenRA.Game/Actor.cs
+++ b/OpenRA.Game/Actor.cs
@@ -324,6 +324,7 @@ namespace OpenRA
 
 		public IEnumerable<string> GetAllTargetTypes()
 		{
+			// PERF: Avoid LINQ.
 			foreach (var targetable in Targetables)
 				foreach (var targetType in targetable.TargetTypes)
 					yield return targetType;
@@ -331,6 +332,7 @@ namespace OpenRA
 
 		public IEnumerable<string> GetEnabledTargetTypes()
 		{
+			// PERF: Avoid LINQ.
 			foreach (var targetable in Targetables)
 				if (targetable.IsTraitEnabled())
 					foreach (var targetType in targetable.TargetTypes)
@@ -339,6 +341,7 @@ namespace OpenRA
 
 		public bool IsTargetableBy(Actor byActor)
 		{
+			// PERF: Avoid LINQ.
 			foreach (var targetable in Targetables)
 				if (targetable.IsTraitEnabled() && targetable.TargetableBy(this, byActor))
 					return true;
diff --git a/OpenRA.Game/GameRules/WeaponInfo.cs b/OpenRA.Game/GameRules/WeaponInfo.cs
index 8cfba690e6..16b6ff2548 100644
--- a/OpenRA.Game/GameRules/WeaponInfo.cs
+++ b/OpenRA.Game/GameRules/WeaponInfo.cs
@@ -132,6 +132,7 @@ namespace OpenRA.GameRules
 			if (!IsValidTarget(targetTypes))
 				return false;
 
+			// PERF: Avoid LINQ.
 			foreach (var warhead in Warheads)
 				if (warhead.IsValidAgainst(victim, firedBy))
 					return true;
diff --git a/OpenRA.Game/Player.cs b/OpenRA.Game/Player.cs
index cc427806ac..1e21983465 100644
--- a/OpenRA.Game/Player.cs
+++ b/OpenRA.Game/Player.cs
@@ -159,6 +159,7 @@ namespace OpenRA
 
 		public bool CanTargetActor(Actor a)
 		{
+			// PERF: Avoid LINQ.
 			if (HasFogVisibility)
 				foreach (var fogVisibility in fogVisibilities)
 					if (fogVisibility.IsVisible(a))
@@ -171,6 +172,7 @@ namespace OpenRA
 		{
 			get
 			{
+				// PERF: Avoid LINQ.
 				foreach (var fogVisibility in fogVisibilities)
 					if (fogVisibility.HasFogVisibility())
 						return true;
diff --git a/OpenRA.Game/Traits/Target.cs b/OpenRA.Game/Traits/Target.cs
index 823daa3cbd..226d2cdd51 100644
--- a/OpenRA.Game/Traits/Target.cs
+++ b/OpenRA.Game/Traits/Target.cs
@@ -96,6 +96,7 @@ namespace OpenRA.Traits
 				if (actor == null)
 					return false;
 
+				// PERF: Avoid LINQ.
 				var isTargetable = false;
 				foreach (var targetable in actor.Targetables)
 				{
diff --git a/OpenRA.Mods.Common/Traits/Attack/AttackBase.cs b/OpenRA.Mods.Common/Traits/Attack/AttackBase.cs
index 8e7fa78869..3580e2cacd 100644
--- a/OpenRA.Mods.Common/Traits/Attack/AttackBase.cs
+++ b/OpenRA.Mods.Common/Traits/Attack/AttackBase.cs
@@ -189,6 +189,7 @@ namespace OpenRA.Mods.Common.Traits
 			if (Info.AttackRequiresEnteringCell && !positionable.Value.CanEnterCell(t.Actor.Location, null, false))
 				return false;
 
+			// PERF: Avoid LINQ.
 			foreach (var armament in Armaments)
 				if (armament.Weapon.IsValidAgainst(t, self.World, self))
 					return true;
@@ -201,6 +202,7 @@ namespace OpenRA.Mods.Common.Traits
 			if (IsTraitDisabled)
 				return WDist.Zero;
 
+			// PERF: Avoid LINQ.
 			var min = WDist.MaxValue;
 			foreach (var armament in Armaments)
 			{
@@ -219,6 +221,7 @@ namespace OpenRA.Mods.Common.Traits
 			if (IsTraitDisabled)
 				return WDist.Zero;
 
+			// PERF: Avoid LINQ.
 			var max = WDist.Zero;
 			foreach (var armament in Armaments)
 			{