diff --git a/src/BizHawk.Client.Common/DisplayManager/Filters/BaseFilter.cs b/src/BizHawk.Client.Common/DisplayManager/Filters/BaseFilter.cs
index 5d18849a5b..d625c3b00a 100644
--- a/src/BizHawk.Client.Common/DisplayManager/Filters/BaseFilter.cs
+++ b/src/BizHawk.Client.Common/DisplayManager/Filters/BaseFilter.cs
@@ -151,6 +151,7 @@ namespace BizHawk.Client.Common.Filters
 
 		private IOSurfaceInfo FindIOSurfaceInfo(string channel, SurfaceDirection direction)
 		{
+			// intentionally not using List.Find for perf
 			foreach (var iosi in _ioSurfaceInfos)
 			{
 				if (iosi.Channel == channel && iosi.SurfaceDirection == direction)