diff --git a/src/BizHawk.Client.Common/movie/tasproj/TasMovieMarker.cs b/src/BizHawk.Client.Common/movie/tasproj/TasMovieMarker.cs
index 5243ed6f53..1fe16aa3db 100644
--- a/src/BizHawk.Client.Common/movie/tasproj/TasMovieMarker.cs
+++ b/src/BizHawk.Client.Common/movie/tasproj/TasMovieMarker.cs
@@ -322,7 +322,15 @@ namespace BizHawk.Client.Common
 
 		public bool IsMarker(int frame)
 		{
-			return this.Any(m => m == frame);
+			// TODO: could use a BinarySearch here, but CollectionExtensions.BinarySearch currently throws
+			// an exception on failure, which is probably so expensive it nullifies any performance benefits
+			foreach (var marker in this)
+			{
+				if (marker.Frame > frame) return false;
+				if (marker.Frame == frame) return true;
+			}
+
+			return false;
 		}
 
 		public TasMovieMarker Get(int frame)
diff --git a/src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs b/src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs
index fd3f9dbdea..f0465545d4 100644
--- a/src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs
@@ -193,7 +193,7 @@ namespace BizHawk.Client.EmuHawk
 				offsetX = -3;
 				offsetY = 1;
 
-				if (CurrentTasMovie.Markers.IsMarker(index) && Settings.DenoteMarkersWithIcons)
+				if (Settings.DenoteMarkersWithIcons && CurrentTasMovie.Markers.IsMarker(index))
 				{
 					bitmap = icon_marker;
 				}
@@ -235,7 +235,7 @@ namespace BizHawk.Client.EmuHawk
 
 			if (columnName == FrameColumnName)
 			{
-				if (Emulator.Frame != index && CurrentTasMovie.Markers.IsMarker(index) && Settings.DenoteMarkersWithBGColor)
+				if (Emulator.Frame != index && Settings.DenoteMarkersWithBGColor && CurrentTasMovie.Markers.IsMarker(index))
 				{
 					color = Palette.Marker_FrameCol;
 				}